Its very difficult to keep a track record of so many altcoins . What i follow is i buy few coins after studying the coins complete details like whitepaper, following their social media and keeping a track record of their milestones and on. I also proportionately diversify the investment so that keeping a record would be easier and less burden on my daily schedule. I would still buy long term benefit coins and hold them for good returns.
You can`t keep track of all of them, its almost impossible, or you need to have some super mind or super program for that. I can`t count how many altcoins I follow, when I open marketcap to see changes, I take a look on many coins, closely look is reserved for altcoins I have and that is between 5 and 10, not more then that.
icorating.com
Good site, I use it often when I need to check some new ico, I like to check also
https://icobench.com/, one information from this site is 194 upcoming ICOs, 306 ongoing ICOs, 384 ended ICOs, close to 1000 icos in just last couple months and next few months. How to know which ICO`s from all of them will be successful?