Are you a student or an educator? Do you need a free textbook? This list of six places to find free textbooks might save you time and help solve your problem.
Plagiarism is cheating. If you copy someone else's work or ideas and pretend it is yours, you are plagiarising. It is dishonest. This form of cheating doesn't just break school or university rules, it can break copyright law.
Active learning is learning where student's brains are actively involved in selecting information to be learned, organising it and connecting it to existing learning to build new knowledge. Passively listening or copying notes is not active learning, and nor is rote learning.