Here are some of the websites that I personally used as a engineering student~ enjoooy~

1.) Khan Academy (recommended)
-a non-profit online platform providing a completely free library of educational “micro-lectures.

2.) Grammarly 
-for grammar Nazi's out there or just doesn't good at spellings and grammar like me :>

3.) Symbolab
-online calculator that can solve almost any kind of math problem!

4.)Canva
-online if you want to use a simple yet powerful online graphic design platform.

5.)Youtube
-of course this is the OG website that can help you on anything. even the videos are almost 5-10 years old it is still helpful on my college topics that I find hard to learn from my professors

If you recommend anything feel free to comment here~ have a great day!