New to this...

Sophie • Ttc for baby #2
Hi!
I'm very new to all of this and wondering if you lovey ladies could help me out.....
I had my implant removed 19th oct and started my first period yesterday. I was on the implant for 4 years and never had 1 period. 
There's lots of things I don't understand on here such as 'Dpo' 'AF' even TTC but I'm guessing that means trying to conceive.... 
Please could you help me out so I can understand all the posts!
Thank you :)