Bitcoin is different than any currency you’ve used before, so it’s very important to understand some key points. You can use them to send or receive any amount of money, with anyone, anywhere in the world, at very low cost. Bitcoin payments are impossible to block, and bitcoin wallets can’t be frozen. Actually, the Bitcoin network is unstoppable and un-censorable.
Update 1st October 2018: The cryptocurrency market has been volatile as ever over the last 6 months. Unless you are a skilled trader, it is harder to make money in a bear market than in a bull market – and we have been in a bear market for some time now. Personally, I have stopped trading and I am now focussing on growing my portfolio passively using a cryptocurrency trading bot – you can find out more about this here.  If you are new to crypto, read on!
Sub or Substratum is another open-source network with a huge focus on decentralizing the web and on “making the internet a free and fair place for the entire world.” This platform allows content creators to freely host their websites or applications on Substratum host, without any censorship blocks. Network users can then “run” Sub nodes and help the content get forwarded to end web users, who can access all Sub content in regular web browsers without any blocks or limits in shape of censorship.
Sometimes, it can be easier to enter a position than it is to exit that position. Certain exchanges are fairly illiquid: they don’t have enough buy orders to support easily selling off your cryptocurrency at a good price at any given moment. At other times, exchanges that usually have healthy liquidity might have really low trading volume — for instance, if you’re trading on a holiday or weekend.
Consider Bitcoin as the base layer coin for the market as many of the exchanges price their altcoins against Bitcoin. Also, Bitcoin is often used as your base currency to get started with an exchange. What I mean by this is you will not be able to buy with your regular credit card, you will need to transfer in your Bitcoin and use that as the currency to purchase.
Let’s say you have heard that the car’s price will rise in one month. This information is not confirmed yet, but you want to buy a car already especially when you had this intention before. The other has the same wish as the will have to pay more after car’s price inflates. This will lead to the price growth as demand will rise as compared to supply.

At this point, you have narrowed down your list to a few cryptos that have a good potential for profitability. But you need to narrow down further and find the ones that have the potential to take-off faster than the rest. That’s why you need to keep in touch with the news.  Check out crypto news from different sources to determine, which of the cryptos you have in your bucket-list have some interesting news coming up.

The second reason to buy the most liquid coins is that there are risks of scams. When you purchase Bitcoin you are sure that you will be able to sell it to somebody later. However, when you buy X coin, which is not as liquid and as popular as Bitcoin is, your risks are higher as everything depends in this case on the project, its team, goals, roadmap, background etc.
Disclaimer: This information should not be interpreted as an endorsement of cryptocurrency or any specific provider, service or offering. It is not a recommendation to trade. Cryptocurrencies are speculative, complex and involve significant risks – they are highly volatile and sensitive to secondary activity. Performance is unpredictable and past performance is no guarantee of future performance. Consider your own circumstances, and obtain your own advice, before relying on this information. You should also verify the nature of any product or service (including its legal status and relevant regulatory requirements) and consult the relevant Regulators' websites before making any decision. Finder, or the author, may have holdings in the cryptocurrencies discussed.
EDIT: #10 Bonus (Suggested by @kerstenwirth ) — always check the ticker symbol. Ticker symbols are not universal, and may vary from exchange to exchange in rare cases. Those cases, though, can come back to bite you. For example, Bitcoin Cash trades on some exchanges as BCH, while it trades on others as BCC. BCC is also the ticker symbol for BitConnect, which was recently outted as a Ponzi Scheme. If you bought BCC under the impression was Bitcoin Cash, you would’ve lost a lot of money.