I want to learn salesforce. What are the best study materials (books, video tutorials, etc.) can you suggest?

Trailhead: https://trailhead.salesforce.com/en...

Trailheads
Developer docs
And learning on the job is a must.

Having a background in OOP helps.
Oh and unit testing is a must.

If you are looking at lightning development a JS background will come in handy as well.

Learn how to read. There are so many different ways to learn how to read. You can use flash cards or phonics books or even start with just knowing letters and sounds like A, B and Cs. You can also try this https://careersbooster.com/our-serv... site where they teach kids how to read with music or rhyming words. The great thing about learning how to read is that it will help with strengthening other skills later on like writing and spelling as well as math and science!