Newbie trying to get started

I just signed up for for Pro and have downloaded the desktop app. Trying to find a good tutorial, but every YT video "for absolute beginners!!!" is starts out: Download claude Open claude Add this skill, then connect your MCP, and then this three page prompt will perform tax loss harvesting while generating your artifacts report for your 57 companies Like WTF? I'm just a engineer dude with a mac and a linux server and I want some help writing scripts to backup my "linux ISOs". setup my docker containers, an