Long or short term depending on the investor, if the investor is a beginner then the long term is better, if the professional investor will usually use both, the short term when the development of the coin is slow and the long term when knowing the potential of the coin being held.
Usually the coins that are held for the long term are major coins that are ranked in the top 50 of the market cap.

In general it is like that, when the price of bitcoin rises, the altcoin price tends to be corrected, if the price of bitcoin is corrected the altcoin price will also be corrected,
but actually there are other factors to find out about it, namely looking at the position of the bitcoin dominance chart at that time,
For example, when the chart of bitcoin dominance correction and the price of bitcoin is sideways, the altcoin price will go up.

Cryptokitties one of the games that uses NFT before NFT is really hype
but there the art of NFT, NFT has a lot of uniqueness, not only as an item in the game, but it can also be a digital art that is of very high value because it is rare, and its uniqueness can also be proof if something is ours, such as a certificate
I see the NFT will grow bigger in the next few months or the next few years.

If we look at the bitcoin chart on the big TF the market is not yet bearish, I believe this is because the altcoin season hasn't started yet,
if in case the bitcoin price goes down it is due to correction, and correction is a natural thing so that the trend can be resumed.
All altcoins will have an impact when bitcoin correction, a big impact will usually occur in altcoins whose price increases very high.

What you said is true, polkadot was ranked 3rd in market cap a few weeks ago, but it didn't last long.
Polkadot has extraordinary technology and also low transaction fees, this is the reason many people assume Polkadot will kill ethereum, but I see that Polkadot's vision and mission is not to kill ethereum, but rather want to be another version that is more perfect than ethereum.

Bitocin can be owned by anyone, as long as you want to own bitcoin you can store it,
even with $10 you can buy bitcoin, it's just that you will only get a small amount of bitcoin, with the current price of $ 2000 bitcoin and you want to buy bitcoin with a capital of $10 then you will get around 0.00017979 BTC

Waiting for the price to stabilize is the right strategy, I personally don't even follow that FOMO, if you pay attention not all the prices of coins listed on the top exchanges have risen very high, that FOMO sometimes happens before the listing starts,
like FIS coin its price increased to $5 before listing on Binance, and when trading starts its price tends to be corrected.

If we look at today's Dogecoin price of $0.05, then for $1 it won't be too difficult for Dogecoin as long as Elon Musk and his followers still support this meme coin, I will be a little pessimistic that Dogecoin will go to $1 if there is no support from Elon Musk, because Dogecoin is fundamentally not strong enough.
But who knows the future, this bull market is very different from 2017, maybe Dogecoin has other supporters besides elon musk and the price is pumped to $1.

It's better for you to hold Ripple than Bitcoin, I read the news that if Ripple's problem with the SEC will be resolved soon, fundamentally ripple will be back and there will be a lot of good news, technically ripple chart is still in the bottom, you should try to look at the BTC pair, the potential for Ripple to increase higher is huge.

To sell the coin you are holding you have to confirm the current market trend, if it is bullish then it is the right time to sell your coin, but if the market trend is bearish then it is better to hold it,
If you want to sell and the market is bullish, make sure you sell it when the coin price has touched its old ATH, because in most cases when the market is bullish a lot of coins have touched the old ATH, and that's the right time.

Your strategy can be used optimally if traders have a mature plan, one of which is by using good trading management,
selling gradually and buying gradually is the right way to get maximum profit, and will also help us not to rush into trading,
but this strategy will not work perfectly if you don't know how to determine the support and resistance areas, because the support and resistance areas will help you sell or buy coins gradually.

Many faucets are closed after the price of Dogecoin has risen very high, I know this because I tried to open my old account, and most of them were closed like Faucethub and Moondogecoin,
but in my opinion, many faucets are closed not because the price of doge has increased, but because many people prefer other ways than faucets, such as farming or staking, now only with a low capital of less than $10 can get free coins without completing a captcha like on a faucet.

Actually investing or trading are both profitable, but the problem is, does someone have enough time and ability? because if one does not have much time and does not understand analysis then investing is better than trading, and vice versa if one has a lot of time and is knowledgeable about trading analysis, then trading can be a good choice.

Although the maximum supply of ethereum is unlimited, ethereum ecosystem and usability is much better than that of litecoin, which is why the price of ethereum has risen so high. and also the hype about DeFi, DEX, Farm, Liquidy Pool as well which is another reason ethereum price increases and makes new ATH,

I am sure Dogecoin will not be able to touch the price of $1 if Elon Musk and his followers do not support Dogecoin anymore, the price of cryptocurrency is very dependent on market demand, without market support and demand the price of Dogecoin will decrease very quickly, this is because Dogecoin does not have strong fundamentals, So when the market support and demand decreases, it is very difficult for Dogecoin to increase its price higher.

You should try to see from another point of view, the quality of a coin is not in terms of price, but in terms of function as well as liquidity.
like USDT and BUSD, although they are stable coins, they have different advantages and disadvantages.
But due to the development of cryptocurrency, and many coins that have smart contract functions like ethereum, stable coins like USDT are already registered on many networks other than ERC20, such as USDT which runs on the TRC20 and OMNI networks.

Emotions and mentality can be controlled by learning proper trading management, which is why every trader is encouraged to trade using his own plan, not following trading signals.
As long as the trader understands this method, he can control greed and minimize losses, but this can be done if the trader realizes that with his shortcomings, without realizing it all will be in vain.

Stop the trade is not a bad decision, it's better to lose a little than to lose more because you force yourself to trade,
but if I can give any additional advice, it is better to stop trading for a while and use some of our capital to learn technical analysis of trading, this is the right way than forcing ourself to trade.

Stop Loss is used to minimize losses, small or large time frame must use a stop loss, especially traders who trade many coins at once.
In my opinion, stop loss is very mandatory, especially when trading in the cryptocurrency market, because sometimes the market moves beyond your expectations, the price can fall by more than 30% in a few hours, such as the events of 12 March 2020, the price of bitcoin fell by more than 30%, if at the time it didn't set a stop loss, I believe the loss is very much.

Mining bitcoin requires a lot of capital, if you have a lot of capital then mining bitcoin is still profitable, but if you don't have large capital I suggest you don't mine bitcoin and choose to mine in other ways, such as holding coins that support staking, coins which uses PoS consensus created to solve the PoW problem because mining consumes a lot of electricity consumption.
Examples of coins that use PoS are like Zilliqa and Cardano, you only need to hold a few coins then you stake, and you will get more coins as a reward for holding these coins.