Can someone give me information on the book netzach Yisroel by the Mahral, like what is it about, what category does it fall under, and difficulty level reading and understanding it?
Netzach Yisrael is a philosophical work on exile and redemption written as part of the Maharal's series on Jewish holidays to correspond to Tisha B'Av. It is at a fairly advanced reading/understanding level. Rabbi Yehoshua Hartman has put out an extensively annotated 3-volume edition (e.g. sold here or here) which, while still quite advanced, renders the text much more accessible. You may find the following links useful as well:
I have it it has 2 major sections, the first part is about the destrouction of the 1st and 2nd beis hamikdash's, and the 2nd part is about Geulas Maschiach. The Maharal zt"l seforim are pretty hard to understand in general so to be able to understand, so you have to have a strong grasp on hebrew and in Jewish Concepts/fundamentals to be able to understand his seforim.