Checking fluids

What all fluids are on a wr250r besides oil will you please name every single one. I'm here to learn. Also, how often should I check them? Do I check them all in one go or are there some I don't have to check as often as others? I don't want any of my bikes fluids to get too low because I failed to check them. It's a 2020 wr250r with a little under 1900 miles on it and so far all I've done to it is changed the oil and filter at the 600 mile mark and tightened the chain

Your owner's manual contains all of this information.