I went through a period where I checked every day, and have log books filled with data in order to watch trends with different types of filtration, frequency of water changes and the like.
My list was
alkalinity, pH, nitrate, dissolved oxygen and conductivity/salinity
My parameters leveled out completely with a regime of every other day 30% water changes, and filtration using fractionation, filter socks (rinsed with every water change)and planted sumps.
I now seldom check after years of rarely changing numbers.