Fireship has a solid video here. Create awesome content, render properly- structured bot-friendly html, load fast.
Click through rate (CTR): How likely a user is to click on your link when shown.
Bounce Rate. A user clicks through but immediately hits the back button
Dwell time: How long a user spends on your site before clicking back. Long is better.
Average session duration:
Average pages per session:
Bot-friendly SEO: Look up this meta stuff later
Good ahrefs article here
More notes on sitemaps, especially within WP, here
Quick video on robots.txt here