It takes quite a lot of research. I came to the realization that 90-95% of coins are very poor investments and the percentage of bad ICO's is substantially higher. Some of the first steps I take are;
-Making sure the business model and tokenomics make sense (they almost never do)
-Making sure they have an actual working proof of concept or some practical implementations (partnerships and ideas mean NOTHING),
-A utility that is useful and unique. I never look at coins that only function as a currency because they don't distinguish themselves and I can't guess where consumer confidence will shift.
I tend to bend the rules a little bit for very speculative projects but that is conditional on outstanding technology, team, and plan.
I made a video about some of the uncommon tools that can be used for coin analysis. This is not a great overveiw though because I didn't want much overlap with other content; 
If your interested in technical analysis it is not my specialty but this video sums up the basics using Binance; 
Keep in mind my focus is on long term coin analysis and finding the most innovative technology. If your looking to swing trade my advice is useless.
RE: Welcome To The Altcoin Analysis Steemit