I joined freecodecamp last year September, and I have earned one certificate so far. You may have guessed, the Responsive Web Design certificate, now called Legacy RWD. I am completely on my own all through the journey up till now. I am not really familiar with the forum, of course, I am happy I do now. This post is for beginners like me and I would like my senior colleagues to make contributions as well.
null and undefined,
objects( object literals, arrays, functions, BigInt, Set),
control flow(for loops, while loop, if else statements, switch statement) etc.
I hope you get my points. And basically, all the while, I did make sure to attend my FCC classes, did my lessons and take my notes. Freecodecamp is the best and it pushes you to learn a lot. Never give up. Just keep practicing and believe me, JS will become a second nature.