Cryptocurrencies are not all the same. Some are mined while others are created all at once and slowly released into the market. Some cryptos earn a type of interest when owned and some are tokens used by innovative development networks/platforms. Other considerations like the maximum supply of a cryptocurrency, alternative uses (other than being an exchange medium), can greatly influence its future performance.
I am sorry because I am unable to give you a personal recommendation as we are a comparison website and general information service. Your decision would entirely depend on your needs. You will also need to put in the time to learn how each platform works, where each feature is and how to utilize it. Kindly spend some time with it and continue doing your research. You may find a list of trading platforms on the page you’re viewing. You may click the green “Go to site” button and/or the links for you to read more pertinent information about each option.
Notice the small bull run. Now imagine we had decided to buy Ethereum somewhere around that dotted line and just before 8pm. We saw it tick up after a string of bearish candles, and for whatever reason, thought it might continue it’s way upward. To minimize our losses (remember our goal is minimize losses and maximize gains), we set a stop order right away. We’ll set it near the bottom of those last couple bearish candles (about $474). Now as we watched the price work it’s way up, we would continue to raise our stop price. To do this, we would go to our open orders (every exchange will show this), and click cancel on the stop limit that we had just set. Shortly after 8pm, we might’ve had a stop at $480 that would’ve been triggered. If you’re stop limit is triggered and the signs point to the trend continuing you’re able to buy back in with a profit already in your pocket.
I bought Elastic $XEL at the obscure Heat exchange. It was rather difficult discovering how to buy it because I was in this case ahead of the herd where the path was not well defined. In the end I bought it at a high price (average 31,367 Satoshis, should have got them at 25,000 Sats) as I got scammed over at Heat by a predator (Arsonic @Ars0nic on Twitter) playing the order book. We’ll see how that plays out. I think the excessive price I paid will not matter too much.
I would also encourage you to have a secure place to keep your passwords, maybe written down in a couple of locations or stored in a password manager, just create something which works for you. Also, keep a copy of your private key for each wallet. If you lose your access and lose your keys, then you lose your coins. Don't worry; this is not necessary with every wallet, for example Coinbase and a Nano S will manage your private keys for you, this will all start to make sense once you start.
So you can identify cryptocurrencies that will survive into the future yourself. The market is damn volatile and when you allow suggestions, everybody is marketing their own cryptocurrency everywhere, so you end up getting what many people use but not what might truly survive in the long term. So make your own decision by knowing what makes a cryptocurrency survive for long.
A “manageable amount” is obviously subjective and will vary for each person based on things such as time available to dedicate to trading. Feel free to do your own research to find the right exchange for you. I tend to value user experience of an exchange over the amount of coins on it. Ultimately, what exchanges you use is going to depend on your own personal preferences. GDAX and Poloniex will provide sufficient resources needed to be a successful trader, so they are definitely a good place to start.
When buying coins, and especially with Bitcoin, you will notice that your purchase is in decimal. A Bitcoin itself is relatively expensive, around $10,000 at the moment (as of 15th Feb '18). If you were to purchase say $5,000 of Bitcoin, you would at today's rate be purchasing around 0.5 of Bitcoin. Do not ever worry about this; Bitcoin operates at eight decimals places. You do not need to own a whole Bitcoin or any coin for that matter. Consider it like pence in the pound or cents in the dollar, but with more decimal places.
If you are going long, consider building an average position (for example via dollar cost averaging or value averaging). There is no better way to avoid making a poorly timed trade than buying incrementally instead of all at once and thereby buying an asset at its “average” price over time. If you don’t have a really solid grasp of technical indicators and the way the volatile crypto markets work, consider averaging out of positions as well. Averaging isn’t just financially conservative, it is important psychologically. Taking too big of a position at once can be emotionally difficult to deal with (and can thus lead to bad decision making) given the historic volatility of the cryptocurrency market.
I prefer to trade on decentralized exchanges. For myself, I made a choice in the form of ethnermium.сom. They have a huge number of coins. There are no minimum restrictions on trade and fees are so insignificant that you will not notice them. I also think the advantage of the easy creation of a wallet like MeW and easy integration with metamasks and a high level of security

For instance, ZClassic will be forked to create bitcoin private, and all holders of ZClassic will be rewarded with bitcoin private on a one-to-one ratio.  This is big news and if ZClassic already meets the rest of the other criteria discussed above, then this news would be guaranteed to earn it a place as the crypto to invest in right now. That’s because the demand for ZClassic will most likely grow in coming days as people seek to earn some free coins.

Before buying into a position on an exchange, it’s probably prudent to consider whether there’s enough liquidity to make a well-timed exit. Day trading is all about timing one’s trades, and many cryptoassets and exchanges don’t have the liquidity to support the near-instant trades an experienced trader might be accustomed to in trading stocks or forex. Consider checking the 24-hour volume of the asset, and verifying that the exchange allows you to both buy and sell the asset — some only allow you to buy, and some that allow you to sell might temporarily turn off selling at times of high volatility.
I’m not going to go too deep into other ways you can earn money with cryptocurrencies because I don’t do them myself. At least not right now. Passive income is great. After you make an initial investment, you mostly sit back and watch the money roll in. It’s like buying a home and renting it out - there will be some maintenance issues but it’s mostly passive income.
Bitcoin (BTC) has been engaged in a predictable up and down pattern where it absolutely crashes at the beginning of any year and then sky-rockets as the year nears its end. Bitcoin held steady at around $19,000 in December 2017, and then sure enough – crashed big time to around $6,000 at the beginning of 2018. At the time of writing, March 8th 2018, the price of Bitcoin is relatively stable between $10,000 and $12,000. In my opinion, the price will run again soon.
If somehow, you’ve only heard of one cryptocurrency, it’s probably Bitcoin. It is the biggest cryptocurrency — it currently has a 40%i share in the total cryptocurrency market cap! It is the oldest cryptocurrency and it still dominates in the market. So, if Bitcoin continues to increase like it did in 2017, then investing in Bitcoin might be a good idea for 2018.
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Here you are completely abandoning investing and are now only speculating. Daytraders use the same technologies we described above. Their timeframes are simply much shorter. It’s called daytrading because the positions should be closed by the end of a working day. Some daytraders sleep badly if they own coins overnight. Who knows what might happen at night?