If your questions already exist, search for those. Look up your local public library's online catalog. Some even provide free access to Udemy, Libby, and Overd

If your questions already exist, search for those. Look up your local public library's online catalog. Some even provide free access to Udemy, Libby, and Overdrive. Some of those have content (free) from Great Courses, for example. Try free online textbooks. Make small experiments on your own. Write up your experiences. Who knows; maybe someone had the same question.