Manner adverbs (slowly, slinkily, delicately) describe the manner of some action or process.

University of Michigan - Ann Arbor

Adverbs generally modify something (often verbs, hence the name “adverb”, but also other adverbs and entire verb phrases).

Adverb

An on-going but a helpful book resource about NLP
https://web.stanford.edu/~jurafsky/slp3/

Directional adverbs or locative adverbs (home, here, downhill) specify the direction or location of some action.

Degree adverbs (extremely, very, somewhat) specify the extent of some action, process, or property.

Temporal adverbs describe the time that some action or event took place (yesterday, Monday).