RCIA preparation - the class that can be taken by anyone interested in learning more about the Catholic faith but is especially for converts or reverts - is full of great information. (Hopefully.) But sometimes while it's covering theology it misses some of the basics for how to be Catholic. Lingo, traditions, and which knee to genuflect on - those are things you'll want to know too!
This is definitely not an exhaustive list but it's some of the ones I had to learn as an adult or have seen asked repeatedly by converts and cradle Catholics alike.
Hopefully you already know all this stuff, but if you don't I hope you find this list helpful.
1 - When you genuflect, your right knee touches the floor.
2 - At adoration, if the Eucharist is in the monstrance, it is customary to go down on both knees.
3 - Make the sign of the cross with your right hand.
4 - The Church asks that you go to confession once a year, just before Easter is a good time to do so. However, going six times a year is even better and going twelve times a year is better yet.
5 - After Mass you may see people kneel and pray instead of exiting immediately. They are "making a Thanksgiving" - saying a short prayer, from their heart, thanking God for the Mass and the Eucharist. (Sometimes my kids wave and blow kisses and say "Thank You, Jesus." That works, too.)
6 - You should give to your parish and you should get (involved). Tithe ten percent but also join a Bible study, volunteer to tend some flower beds, teach CCD, attend special activities, serve coffee at the coffee and donuts, help organize bringing in a speaker. During RCIA you are part of a group that is helping you grow in your understanding of your faith and in holiness. When RCIA ends find a new group who will help you continue in that manner, but be sure to give back what you get.
7 - You can eat meat on Friday when it's not Lent, but if you do then you need to do some other kind of penance.
8 - Natural Family Planning is also known as NFP.
9 - NFP works. And it's not the rhythm method. And you are expected to use it if you are married and need to space your children.
10 - Building a Catholic culture in your home should not stress you out. You don't have to do all the things and you don't have to do things exactly like the person next to you. Give yourself time to figure out what works for you, your family, and your season in life.
Did I miss anything? Let me know!