The community is the best source of knoledge about blockchain and cryptocurrency. And you can join bounty campaignes and learn free coins when your activity level is enough

No address ever expires. It is good practice to generate new addresses for each transaction to preserve the pseudo-anonymous properties of bitcoin. A public address will always be valid for the corresponding private address, but you want to make sure you control that private key before sending money to it. Example, if coinbase gave you an address to deposit to, I would only use it once. They may not be monitoring the old ones.

There are PAID and Free bitcoin transaction acceleration services available now which you can use to keep your own transaction from getting stuck.

For example pushtx.btc.com: this service is provided by BTC.com in cooperation with several main mining pools. The fee was around 70 USD on December 20, 2017 and the transaction was confirmed within 3 hours. You can pay by BCH or country-specific methods and they estimate the fee based on the transaction size. They promise a chance of 75% for including transactions in the next block within one hour. Within 4 hours the chance is claimed to be at 98%.

Exodus - The wallet is easy to use, you have control over the private keys, and exodus even encrypts them for you.
Exodus has the shapeshift.io exchange built into the wallet, so that you can exchange your cryptocurrency with one click.

Jaxx - The private keys are stored on your device. It has a beautiful UI, is really sleek and easy to use, and has shapeshift built in.

Freewallet - wallet from Hongkong, stores funds in a multi-signature cold storage with a bank level security grade.

Coinimi - the absolute winner of altcoin wallets. Coinomi by far supports the most cryptocurrencies out of any wallet on this list. It has the shapeshift.io exchange built in and just works flawlessly.

You need to gain 60 activities, and then you'll gain next level. But remember that no matter how many posts you make, there's only 14 activities every two week you can get.

I"m afraid, there's no way to do anything about that. It's the other side of decentralisation factor

You can post as many posts as you like, but you will gain only 14 activity every 2 weeks, so the speed of growth of your account level is strictly limited

That's really a personal opinion. I keep the bulk of mine on Coinbase and Freewallet in the hope that they are well insured and secure. Some of my friends refuse to keep most of their's on exchanges though due to past issues. They just hold on hardware wallets like trezor and not trade. For me trading is a hobby, I enjoy it much

The perfect way to start is to study bitcoinwiki.org-articles and understand the main principles of blockchain technology

For most people in the U.S., Coinbase would be the easiest option to buy Ethereum, Bitcoin, or Litecoin (it doesn't support any others yet). After verifying your account, you can add a number of payment methods including credit or debit cards, U.S. bank accounts, or even wire transfers of funds. Other options for exchanges that will take U.S. dollars for coins are Kraken, and Gemini in the U.S. Typically you will need to verify your account with a driver's license and add other details to expand your buy limits. Since cryptocurrencies are "hard currencies," the exchanges don't want to risk getting ripped off, since you can't reverse a cryptocurrency transaction once it's done.

If you are looking for some of the newer coins like NEO that are making big movement but haven't made their way to the aforementioned exchange sites, you can look into Bittrex, Poloniex or Livecoin. You can transfer Bitcoin or Ethereum to these platforms from Coinbase and then exchange it for any other digital currency that you want.

If you are outside the U.S., here are a few options for exchanges that take your local currency: BTC Markets (Australia), Bitthumb or Coinone (Korea), CHBTC or Huobi (China), and QuadrigaCX (Canada.) You can find a full list on this page of where to buy Ethereum for your local currency.

I also use freeewallet as a second option. My main wallet is myetherwallet, which is the best option we have on the market now. with freewallet never had any issue.

No one knows for sure (with any degree of certainty). Having said that, most agree the future is bright. That statement does have a few caveats. The following is my prediction:

Bitcoin itself as a protocol will evolve. Many people forget the simple fact that it is a protocol first and the money part just happens to be the first app written over it. Think of it like the Netscape browser written for (predominantly) HTTP. It was good at its time, but then other browsers took the mantle and Netscape was dethroned. The same analogy could apply to bitcoins (the money). It could be dethroned and for all we know Dogecoin or Litecoin could prevail.

The Buying process of Bitcoins will have to be made much more simpler than it is at present. All indications point that the process will get more streamlined, so buying bitcoins will be an easy task.
In most countries (US included), companies that trade Bitcoins onto the local currency would be regulated. More exchange companies will mushroom.

Until and unless Buyers keep pressing / asking Merchant to accept Bitcoins, merchants will be oblivious to the demand. If you walk into a store and ask if they accept Bitcoins and they answer No, this is the expected answer. Repeat this scenario with 10 other Buyers asking the same and the Merchant will think differently. They just might start looking at Bitcoin acceptance.

It's not illegal, for now. But there're countries that already think how to regulate or ban it.

I recommend you to do a very good initial research, you can use sites like bitcoinwiki.org or read articles like this https://www.coindesk.com/information/what-is-bitcoin/ to figure all this out

Don’t invest in something you do not understand. If you don’t understand Bitcoin you should not be investing in it.

My advice is that, while you might not need to be an expert in the technical details, you need a thorough understanding of what you're getting into. You need to understand how it works as an investment, how liquid it is (ie, can you get out when you want to), the level of risk and what can drive the price up and down.

My advice is not to invest "just because a friend told you to", but to do your own research and make the decision that's right for you.

Anyone now is a good moment to do so

I would say that for me the most user friendly android app that I tried were binance, freewallet and poloniex. Now I mostly use freewallet, it has better fees

If You Say That Which Exchanger Is Best?  It could be The tuft(There is good or bad)
 But If you say that which Exchanger is worst
I  Can Easily Give my Word truly " Its HitBtc"
I Can Give Some suggestion
Bittrex
Binance
Coinbase
Kraken
Gemini

I think we should keep holding and wait. It'll recover by march

I like Binance as they provide 0.1% fee.  I used to respect hitbtc but after I lost $100 there I became a hater. Now I keep binance acc, coinbase acc and recently got a freewallet acc cause they are really working hard to keep low fees and do btc transactions quite fast and cheep

Forks can occur from two different events. An accidental fork occurs if coin updates are not truly compatible. People using different versions of the software create two different ledgers–one from the older version, and one from the newer version. In this circumstance the coin developer must rapidly eliminate the bugs causing the incompatibilities and decide how to merge the different blockchains.

A hard fork is generated when the cryptocurrency’s developers decide that changes must be made to the programming of the coin that will create incompatibilities between the older and newer version. When the changes are made, all users of that coin must willing to update all applications to continue to use that coin type correctly.

If this is confusing, let us use Microsoft Word for example. Microsoft frequently releases new versions of Word. Each version attempts to be backwards compatible and retain the ability to read and edit older documents. However, often older versions of Word have great difficulty in reading documents created in one of the newer versions. So if you create a document in Word 2007 and your buddy edits and saves it in Word 2013, you may have problems reading it. Despite the assumption that its going to be the same document, you two have created a fork in your document.

You can read more about it at Here's the great project for basic reading [bitcoinwiki.org](https://en.bitcoinwiki.org/wiki/Main_Page)