Adverbs add information to verbs, but also to adjectives, another adverb or even a whole sentence.
They often end in –
Adverbials are other words or even phrases acting as adverbs.
Adverb(ial)s of manner tell how something is done: quickly, enthusiastically, “without even looking”.
Adverb(ial)s of place tell where something occurred: here, away, “in the library”.
Adverb(ial)s of time tell when, for how long or how often something occurred: soon, briefly, “a week last Tuesday”.
Adverb(ial)s of degree tell to what degree something is/was: very, hardly, incredibly.
Sentence adverbs qualify the whole sentence rather than just the verb, e.g. “Hopefully, he’ll arrive soon” –