Don’t go downloading random wallets or clicking on random links, but do accept that you have to share information with exchanges. There is some malware out there, and you need to do research and be careful. However, for all you want to protect your privacy, you have to share your info with exchanges you want to use. So share what you have to and download apps as needed, but be careful and do research.
If you are serious about cryptocurrency trading, I strongly recommend finding a mastermind group that suits your skill level and budget so that you can improve your knowledge, expose yourself to less risk, and gain access to news and tips before they hit the mainstream market – this is where the real money is to be made. In my opinion, your best bet is to sign up to use the Notorious Bot as you get a ton of value not only from the bot but also from the Discord channel where you have access to veteran traders and analysts.
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!
The trading strategy used is bollinger bands. (You can create bollinger bands on graphs in poloniex). The strategy is to buy when price touches lower bollinger band and sell when the price is above your bought price and also hits high bollinger band. If the price goes down and again touches lower bollinger band then invest another 25% of total investment assigned for a currency.
A long-term investment is one where you expect a cryptocurrency to perform better over a longer period of time. Simple! Normally, the minimum time for long-term investment is 6 months to 1 year. Although, some people plan to hold onto their investments for 5-10+ years. It’s up to you how you choose to invest; you can either make your full investment in one go, or you can invest at different times.
You could try this instead: You could try to avoid times where you know there’ll be relatively less liquidity in crypto — like nights and weekends — by closing out all of your positions every night and over the weekend. You might also consider maximizing the liquidity to which you have access by trading on a platform that allows you to access many different exchanges at once, rather than trading on only one or two specific exchanges.
Poloniex was started in the year 2014 and has become a preferred platform for crypto exchange and trading since then. You might want to pay attention to this US based platform as it offers more than a hundred cryptocurrencies to its users for trading. What makes the exchange unique probably the most preferred choice of people like you is that, it holds the highest volume for Ether as it supports both Ethereum and BTC markets independently.
One of the most powerful tools made available by the Blockfolio app is the price tracking functionality it offers. The Blockfolio app is able to deliver running price updates via push notifications directly to a smartphone as soon as a currency reaches a predetermined level, increasing reaction speed for high priority buying and selling actions when prices reach a specific threshold.

Speaking of the last two points, realize that crypto tends to be pattern based and tends to go in cycles. See “the cryptocurrency rotation” and “market cycles” for an in-depth look at what this means. You want to be in a coin before it starts its rotation, and then laddering out as its rotation ends. Likewise, in a perfect world you want to be in for the bull part of a market cycle, and out for the bear part. Near impossible to spot these trends in advance, but with experience you should be able to spot them as they occur and manage your positions accordingly.

Never put all your eggs in one basket. Diversify. While the potential to earn more is increased with the amount of money you invest into a coin, the potential to lose more is also magnified. Another way to think about it is to look at the cryptocurrency market as a whole; if you believe that this is just the beginning, then more than likely the entire market cap of cryptocurrencies will increase. What are the chances that this market cap increase will be entirely driven by one coin vs. being driven by many coins? The best way to safely capture the overall growth of cryptocurrency is to diversify and reap the benefits of growth from multiple coins. Also, fun fact — Between January 2016 and January 2018, Corgicoin has increased by 60,000x, and Verge has increased by 13,000x. During the same period, Bitcoin has increased by 34x. While you would have gotten impressive gains from Bitcoin, expanding into other coins could have landed you potentially larger ones.