Rheumatoid Arthritis Treatment

I was told i had RA. They told my mom some numbers or something, like the normal number is 20 or lower, and i was at 23, meaning i had RA, what these numbers stand for, i don’t know. The doctor also said that with severe cases the number climbs to about 300-400. I don’t ever want it to get that bad. How can i keep RA under control? Or at least what can i do to help prevent it from getting worse? Something? I don’t want it to stop me from being able to do things eventually.