Add your preferred level of salt and pepper

Seasoning usually refers to salt and black pepper, but occasionally to other flavor-enhancing ingredients in the dish such as acid (vinegar, lemon, etc.) and heat (red pepper, sriracha, etc.). "To taste" means to the degree you enjoy it.

to season

verb [ T ] UK ? /?si?.z?n/ US ? /?si?.z?n/

season verb [ T ] (FLAVOUR) ? to improve the flavour of savoury food by adding salt, herbs, or spices when cooking or preparing it:

Drain the rice, stir in the salmon and season to taste (= so that it has the taste you like).

https://dictionary.cambridge.org/dictionary/english/season

to season (v.)

"improve the flavor of by adding spices," c. 1300, from Old French assaisoner "to ripen, season," from a- "to" (see ad-) + root of season (n.) on the notion of fruit becoming more palatable as it ripens. Applied to timber by 1540s.

https://www.etymonline.com/word/season#etymonline_v_23063

The nicest rule I've heard for seasoning (as opposed to flavoring) is:

"Not so much you can taste it, not so little you can't"

You can season with many things: salt, pepper, nutmeg, mace, Parmesan, anchovies, mustard, lemon juice.. I could go on. Seasoning enhances whatever you have decided are your main flavors. It shouldn't taste strong enough to confuse them, It should just make those flavors taste better.. 'more of themselves'.