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.

Almost everyone joins Telegram groups and follows Twitter traders for signals, and there is nothing wrong with that, as long as you do your own research. There is no shortage of ‘shilling’ (promoting coins and market moves for personal gain) across all social mediums, and you will come across tons of people claiming that a particular coin is going to ‘moon’ soon or give 10x gains.
Trading on low-volume days in the market could incur substantial slippage. People who make trades — especially large trades — on low-volume days often will not find many partners on the other side of the order book willing to make that trade. The result is that they could end up paying much more for the trade than expected, incurring slippage in the process.

To stress some points made above, realize that a diverse portfolio and investment strategy will eat into gains as often as it staves off losses. The only way to make big profits most of the time is to make risky moves. If you go all in on a single coin at a given price and it goes up, that is a payday. If it goes down, your investable funds are locked into that crypto (unless you want to sell at a loss). Diverse strategies protect against this, but they will also eat into your potential gains (as it is rare for everything to go up or down at once). Know what you are looking for and know how to weight your portfolio to reflect that.

So let’s take our hypothetical 1 BTC from before and take a short position on Ethereum. We are able to borrow 2.5 BTC worth of ETH and sell it. 30 minutes later, the price of ETH has plummeted 10%. Now we can close our short position, buying back 2.5 BTC worth of ETH; except now, since the price has dropped, we are buying more ETH than what we sold. Our borrowed coin can be payed back and we take the rest as profit!
The smart selection of assets ensures the fund avoids the biggest pitfalls of the industry. Only assets with excellent fundamentals and growth potential pass the strict filtering process. Continuous review minimizes the exposure to bad assets. The portfolio is diversified across the whole blockchain industry, with different cryptocurrencies, technologies, industries, fiat currencies, and traditional assets all represented. The cryptocurrency market runs 24/7, and PentaFund ensures that the funds are protected at all times.
One of the things to know here is that cryptocurrency exchange is not part of the regular stock exchange. They are not the same as Wall Street and its exchanges, although they share same general mechanics. The number of best platforms keeps growing as the market is still forming, here is a top 5 list of cryptocurrency exchanges ranked by trading volume.
There are so many hoops to jump through to set up for mining and each coin has its quirks. The power of your machine and graphix card and your power consumption are all important. My friend mined for 8month Eth and only made couple of hundred bucks by time you subtract power useage etc. He already had a powerful machine used in film industry for video graphix just sitting around so he thought he’d put it to use over that time for a laugh and see what happened. It took many hours messing around to set up and occassionally nursing it over that period. Of course he had to use his machine also occassionally which compromised the performance.
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.
Continually doing these things can lead one to gradually cultivate a strategy: a collection of signals that one is good at recognizing and that have a consistent track record. Some traders only buy or sell once they see confluence: multiple signals indicating the same oncoming reversal or trend continuation at the same time. For instance, they might look for candlestick patterns indicating a reversal on both a short-time-interval chart (like a 15-minute chart) and on a long-time-interval chart (like a 4-hour chart).
No, the successful trader is not me. I’ve gotten lucky a few times and I’m still refining and trying out strategies; on the other hand, I’m part of communities of people who trade on a daily basis to grow their portfolios, and while some of the results can be attributed to luck, a majority of it is based on fundamentals, good habits, and experience.