Recent content by Mathscienceknowledge

I am looking around for the search bar. but all I see is a post thread.

Often when I take notes it seems mindless. I put down an equation and there is all this text. There is often all this text which I can't tell what is useful or useless. Can someone give me some advice?

My experience in mathematics is calculus and I am currently self-studying multivariable calculus. I also have some experience in differential equations.

What are some good textbooks for astronomy and astrophysics? I know of fundamental astronomy and the principles of astrophysics. I would prefer it if it were good for self-study. Also, are there any books that are free?