Generally, it's not hard to figure out -- the options noscript gives you for disabling them are usually clearly labeled. Cloudflare's tracking shows up as "Cloudflare Analytics", for example -- an easy and obvious one to leave on the 'blocked' list.

Just give it a whirl and see how it goes. Install the browser extension, and whenever you visit a site that doesn't work, click on the little noscript button and try changing important-looking scripts from 'blocked' to 'temporarily allowed'. If doing that fixes the site's functionality and you'll be using that site a lot, you can then change that to 'allowed' and have it permanently whitelisted, and it will work every time you go back. (Fair warning, though: some sites have a very long list of different scripts, and it can sometimes be difficult to figure out which ones are required for site functionality and which aren't. But a little trial and error will always work it out eventually. Often, it's actually pretty obvious. Core functionality scripts are often named directly after the site you're trying to use while all the ads and tracking and shit has different names.)