A couple of online courses that cover the basics are https://members.kelbyone.com/course/skelby-beginners-start-here/ and https://shop.johngreengo.com/collections/all/products/fundamentals-of-photography-john-greengo Both of these have more advanced courses too. Some websites with tutorials include https://www.adorama.com/alc/category/photography/ , https://www.dpreview.com/features/photography-techniques , https://www.slrlounge.com/ and https://www.wexphotovideo.com/blog/tips-tricks/