It's impossible to learn SEO without practical experience.
I used to export Indian sarees first. At that time, I gave an organization to do my site SEO. I didn't benefit from it. My site was ruined. Backlinks to the site were increased by buying links from different places. The domain was completely destroyed by posting on various forums.
At that time I studied Digital Marketing from IIEC and special subject was SEO. This course has been very helpful to me. But I have seen that it is never possible to learn SEO without practical.
My most popular blog BONOMALI. Ninety percent of the content of this blog is on the first and second pages of Google.
I'm currently an SEO specialist and I'm freelancing. I have my own team.