This is the 193rd most frequent German word.
besten
"Besten" means "best" (plural or superlative form in certain contexts).
Here, 'besten' is the adverbial superlative form, indicating a comparison in preference among options.
Von all den Kuchen schmeckt mir der Schokoladenkuchen am besten.
Out of all the cakes, I like the chocolate cake the best.
In this usage, 'besten' expresses an opinion or suggestion about the optimal course of action.
Am besten wäre es, heute zu Hause zu bleiben.
The best option would be to stay home today.
In this sentence, 'besten' is used to describe someone as being the best (superlative form) within a specific category or group.