Any Tutorials For Beginners ?

been on wordpress for a long time but never knew to do SEO I am trying to get SEO friendly I mostly share images and youtube links that embed videos .. have very little writing on my post at all I have tried everything .. my images and links are passing got 100% put when I try to post or make a page or gallery can not get text right no matter what I do can not get Page title word in content heading or Page title word in content I watch how many letters and I have tried using my title and keywords in pageor post and nothing I am so frustrated I am about to give up and go back to the SEO unfriendly again is there basic tutorials for this plugin for beginners who never SEO before I picked this plugin it looked easier then the other big name plugin any help would be appreciated

https://wordpress.org/plugins/wp-meta-seo/