Welcome to the site! I hope you have a great time here and if you ever need anything don't hesitate to ask! ;) Also if you'd like, feel free to check out this beginner's guide!
https://www.rpnation.com/threads/beginners-guide-to-rpn.432762/
https://www.rpnation.com/threads/beginners-guide-to-rpn.432762/
Read Below!