This time is extremely different.
Why?
First, the all-time-highs. If you look some major altcoins, like Ethereum, Litecoin, Stellar, ADA, Ripple, their all-time-high are still not yet meet even Bitcoin already did multiple times since $20,000.
Completely different. But Ethereum is already close to its All-time-high, but Bitcoin also already close to its around $40,000 which doubled from 2017 all time high.

Probably the dumps will continue after it.
The recent dump was really huge, we saw the pump of Bitcoin, created multiple highs since few weeks ago, some major altcoins followed Bitcoin but if you observed the Ripple, sideways or dump only.
Some pullbacks above or corrections if incase the dumps will continue.

I think what OP what to tell is the transaction fee? Which for DGB the transaction fee is really cheap but for me there are lot of alternative for DGB if transaction fee is the problem.

Speaking of DGB price.
I don't see any sign for reversal, it just continue getting hammered down. I can tell this is extremely risky to enter on DGB, yes it is cheap, bottom already, but what if it sill do another dump and bottom again? Really difficult.

I understand you about being a beginner.
But the problem of OP here are "not your keys, not your coins", he got a problem about ownership of his/her Bitcoin since the Bitcoin he owned is on centralized exchange and it clearly shows that you really don't own your Bitcoin there and centralized entity may steal your Bitcoin.
About Coinbase, I believe that it is still a centralized exchange.
But you can use Coinbase to buy Bitcoin and transfer your Bitcoin on non custodian Bitcoin wallet so you have the full control on your funds.

I believe that Winklevoss twins are also a hodler of Ethereum and some major altcoins.
Tyler Winklevoss is just using his popularity ofcourse to pump his bags, and I am thankful he is not doing it on some random shitcoins.
Speaking of shilling, people now are more educated and already learned from their experiences about following every other random people on the internet what to buy or what to sell. These kinds of activities may not effective now or in the future.

This is the most awaited of majority, the correction, so they will start to hop in..
Some correction may be a huge red wick, just like what happened yesterday which we saw a lot of long positions got liquidated for the drop to around $28,000, but we saw the price back again above $30,000.
I am looking forward for Bitcoin to pullback or stays neutral.

This also pop on my mind, maybe OP misunderstood Bitcoin mining before, because as I remember, there are lot scam way back before that talking about Bitcoin mining, such as "cloud mining" which you will just deposit your Bitcoin and wait for it, no hardware bought and installed.

For OP, you should be more clear and specific, did you tried to use some hardware before to mine Bitcoin? Do you remember setting up your own Bitcoin wallet before?

I don't think for Ripple, Ripple already hammered by major altcoins especially Litecoin and Ethereum, I rather go for Litecoin than Ripple.
Speaking of Bitcoin, $50,000 is really impossible, I think the FOMO is not yet starting. There are still lot of people want to buy Bitcoin even some people are waiting for some corrections.

It seems like the 70+ level was rejected and I believe that this was the reason why we saw recently a huge pump for some altcoins, like Ethereum.
If you can check the August 2019, there you saw also the rejection from same level now.
So what I am speculating on Bitcoin now is, Bitcoin will do sideways or dump, then alt season will start?
It's still difficult, since there are still lot of buyers for Bitcoin even how expensive now.

You can check here on how to verify the electrum signature : https://bitcointalk.org/index.php?topic=5130429.0
Just make sure you download it to the official website of electrum.

If you are using MacOS, you can go to the list of applications and then find and remove the Electrum application.

Is your wallet already have Bitcoin? Or you already used it for some transactions?
If you still don't have Bitcoins there or not used, you can forget it and create a new one and the first thing you will do is to backup the seed first before funding your wallet.

Some people may start to worry about their exits (if not for long term). Some may start to worry where to sell or exit their positions. But for me, I am not that worried, I am for long term here.
But I am curious about the FOMO for every broken resistance.
How we can identify when the FOMO will start or just like what happened in 2017, it was really a huge parabolic run for Bitcoin  then a huge drop happened immediately.

Do you still remember your account details in Robinhood? Those funds are important, you should still able to login in your account.
I agree with figmentofmyass, that even you may not able to withdraw a real Bitcoin there atleast if you liquidate your account to fiat, you will still able to receive some profits and you can use those to buy actual Bitcoin.
Alternative wallet for your Bitcoin is a hardware wallet, go try to explore some, just like Trezor and Ledger hardware wallets.

For what I can see on Polkadot, it is still early. The project is still young.
Goals of Polkadot are some features didn't or difficult to achieve by Ethereum.
I hold some Polkadot, but it small allocation from my portfolio and to be honest, if I bought Bitcoin instead of Polkadot before, I have much more returns. And I am somehow disappointed because I have some Bitcoin before that has converted with Polkadot, but it's ok for now, I'll just ride the flow.

Is #AltSzn still possible?
As what happened on some major huge marketcap altcoins are being hammered these past few days, just like what happened on Ripple about SEC issue and som privacy coins being delisted on some exchanges.
I am worried about what some people are waiting for a long time, the alt season, where we can see a huge price action or pump for some altcoins, huge marketcap or small.
What's your thoughts on alt season? Do history repeat itself?

This sad news is kinda the same with what happened on XRP about SEC issue, a huge dump also happened.
Bittrex and followed by some major exchanges just Binance, I think the dump will still continue just what happened on Ripple.
I am very thankful I am already done looking forward to covert my Bitcoin to some privacy coins, just like XMR and ZEC.
Having this issue, being a good privacy coin of Monero and ZCASH will no effect, I believe these privacy coins are quality and still useful.

Bounty campaigns are already different now compare with previous years, like year 2017 and below.
There are some bounty hunters who already stopped after the huge dump after 2017-2018 bull market, which lead most of the bounty tokens being worthless or some bounty campaigns ended not paying the bounty hunters.
What I want to see in the future is they will become more responsible soon, avoid promoting some suspicious projects, although it is kinda difficult to identify.

These people who are using eBay to buy Bitcoin may not really that techy or not really know what Bitcoin is.
I already saw before like this, but on different online shop, not on eBay, the product is really an amount of Bitcoin then you will buy it with different payment method based on the online shop or the seller.
This kind of problem is difficult to supervise by Ebay on their own platform, they may minimize but cannot totally remove or avoid.

Governance tokens may be centralized on different aspect.
Since governance token can be success or driven by holders of the token, so if you own a huge amount of tokens then you have a big allocation for voting, your vote is very huge, this is one of the problems I can see with governance tokens for being a centralized.

I already followed this guy on twitter for long time ago.
I just known that this guy is a NFL player, just wow. If you are updated on his tweets about Bitcoin, you can really see that he is for long term on Bitcoin.
I admire this guy because he is not some personalities who are just become a fan of Bitcoin once Bitcoin already in bull run not for this guy or some popular Twitter accounts that even on dumps and pumps of Bitcoin they are there.

I am surprised for what happened on Polkadot recently, it already created a new all-time-high. A very huge percentage gained in just a short period of time.

What my attention got was the involvement of Binance exchange;

This is kinda different advertisement of Binance, do you believe that this Binance homepage exposure is the only reason of the pump or the 10m usd Binance donation to support the Polkadot?

Read more here: https://www.coindesk.com/polkadot-surges-after-binance-home-page-listing-10m-endorsement