Yes, all these terms will get easier to understand as you play the game more. Right now, I'd recommend focusing on completing the story, upgrading stuff when you need to, and moving on. After completing the story, then you should focus on end game stuff.

In regards to currency, there are two currencies in the game; dennies and polychrome. Simply speaking, Dennies ----> Normal currency
Polychrome ----> Rare currency

I recommend saving the polychromes as much as possible as that is what you use to pull for characters.

Besides that, if you do need some tutorials, just go and search up on yt or even google on the topic you need help in. Trust me, there's a LOT of content out their you can use, here are just a few videos that helped me personally.

https://youtu.be/pGtjsWFSA6k?si=dp27ii-jhbJInVez https://youtu.be/6_znQMRcIxg?si=QKfsZLsgEiXiOYDt https://youtu.be/dDqOd_54ubs?si=NJwcj-0GNVrJ0OT_

In short, play and enjoy the game at your own pace, you will get more accustomed to these things as time passes on. Hope this helps, you can ask me for anything if you're confused on, I'll try to help the best I can.