Forgiving, budget putter for a player just starting out?

Had my first lesson with some more booked. Playing games at my local par 3 course with some Callaway Strata clubs I picked up a few times a week. (Range 4-6 days out of 7, putting green 3-4)

After the first 18 with them I figured I actually quite liked the driver despite the negative reviews I saw it had (first driver I could hit with distance and decent straightness) but the putter just felt horrible to me.

I need to get a new one, but looking to get a somewhat budget one that'll be rather forgiving in case I want to buy another/upgrade moving forward.