It is always a good thing to understand the space you want to be delving into and some of the coins that can be traded and why you would want to be trading them which is why I believe that coinmarketcap is a very useful tool where one can find all these information and concentrate more even on the top 100 and one that would be good enough to trade based on one's style and strategy.
Coinmarketcap.com is a good tool to know the standing of the coins in the cryptocurrency market as well as its volume and its average price. Another site that is the same as coinmarketcap is
https://coincheckup.com/. They have the same features but the latter one is I think better because it has additional information when it comes to ICOs and has three different kind of analysis like fundamental analysis, investment analysis and github analysis.
There are other tools that would be reliable but nothing is more reliable than one's knowledge about trading and the market as a whole which is the basic tool needed to do things right. There are no specialized tools needed for alt trading as it has no differences from forex trading or from BTC/USD trading.
As for the charting, trading view is a good site because aside from doing your charting for free, you can follow others who are showing their analysis to the public so you have reference to the coins that are worth looking at and then you can learn from them as well. You can follow some telegram groups as well that give insights to how well the market is doing. Do not join pump and dump groups though.