Can someone please explain CM?

Sammi • 25yrs old, Mumma of 1 beautiful daughter (3) married for 4yrs & just got my BFP after 1.4yrs TTC #2 ❤️
What am I looking for with the CM to know when I'm ovulating?
​Been on the depo for the past year and haven't had a period since before then so trying to figure out my body signs!
​TIA :)