Best/Fast/Quickly does not exist in the SEO world.
Buy a domain, connect it to Google Search Console, and Google Analytics, start testing, search for keywords, write texts for those keywords, find up to 5 KD keywords for around 500 searches a month, create images, and test everything you need to test, that's your best advice.
In my life, I learned everything by myself, yes, it was difficult, but it was worth it.
No videos, paid courses, schools, none of that can teach you better than you can prepare yourself, in the end, it's all called experience and money cannot buy those things.
So, test, test, and test more...