Networking Assignment Help: A Guide for Students

I'm working on a class project and could really use some networking assignment help. The assignment includes fundamental topics such as IP addressing, subnetting, and routing, but I'm having difficulty connecting the dots in practice. Is there a decent method to break these things down, or any resources that explain them in a straightforward, step-by-step format? I'd also appreciate suggestions for frequent mistakes to avoid. Thank you in advance.