If you want you can join a crash course related to it or you can prepare then through NCERT books to understand the concepts.

You can make your important notes which help you at the time of revision as well.

Make sure you read S-Block throughly as it holds 6.67% weightage in JEE Main exam. You can alo solve MCQs related to this topic.

For preparation refer past year papers and you can also solve chapter wise mock test.

Good Luck!!