Generally the ones by Ahrefs, SEMRush are quite good for intro. Personally I found stuff from AuthorityHackers, Carl Broadbent, IncomeSchool to be more suited to my style since they give more real life examples.
Another gem in the world of SEO courses is the SEMrush Academy. They offer both basic and advanced courses, all for free! Their lessons are a blend of videos and readings, catering to different learning styles. With real-world examples and updated content, it's worth checking out.