Overwhelmed beginner

Ta
I feel silly saying this but I'm 20 years old and just barely downloaded this app a few weeks ago and I feel so overwhelmed and clueless to all the things I'm learning like when to and how to tell you're ovulating, new terms (to me) like DPO, BD, TTC etc but I'm slowly getting the hang of a few of them, I just still am confused on how to tell when I'm ovulating. 
I feel like a moron to be honest and I feel like I should know all this stuff or learn it more easily.
My husband and I aren't TTC yet because he leaves for the Airforce BMT in December and he wants to be here for everything. Also I take Jolessa so I only have my period every 3 months so I feel like that is making it a little harder for me to know when I'm ovulating and to learn all of this stuff haha.