here is my recommendation on how to learn technical SEO (assuming you already mastered using a computer)
Start by learning basic HTML, CSS and Javascript. I'd also recommend codecademy for this. Build a basic website with a few features. Focus learning on responsive web development.
Once you've gained an intermediate familiarity with all 3 of those, I'd recommend learning another advanced language. PHP / Python come to mind right away but you can get away with learning just bash.
Study databases and pick one to learn such as SQL / MySQL
Install a Linux server from top to bottom on a local machine, and learn enough Linux to make programs, edit server configuration files, optimize servers, local and remote filesystems, ssh, etc. Focus on Apache (web servers), response codes, optimization, etc.
here is my recommendation on how to learn technical SEO (assuming you already mastered using a computer)