Celsius is pretty easy. You probably like 20c inside year round. The high teens to mid 20s are comfortable. 13c and below is quite cold. 25c and up is quite hot.

If you use a PC, your temps are probably 30-85c, which is an easy way to learn too.

“30 is hot, 20 is nice, 10 is cool, 0 is ice” is a good way to learn human temps.