Help a sista out please

Mattie • Married to the love of my life. Mother to sweet baby boy - 27 months. Pregnant with baby boy #2!
I'm new to the app and I LOVE it! But I don't understand all of the acronyms y'all use! (Sorry If I'm typing them wrong) but for example: bd, BWW or the ones with letters and a number...I feel out of the loop with what people are talking about! Thanks so much guys!!! ❤️❤️❤️❤️ (I know there others also)