A number of adverbs are used to describe the frequency of an event. By doing so, these adverbs describe how often something happens.
Examples: constantly, frequently, occasionally, sometimes, usually, never, always, rarely, daily, weekly, monthly, yearly

Some adverbs tell us when something happens. Adverbs of time include words that refer to specific times and more general time periods.
Examples: today, yesterday, tomorrow, tonight, soon, later, now, eventually, forever, still, yet, early, late, recently, since

4. Adverbs of manner
Adverbs of manner tell us how something happens. A huge number of adverbs fall under this type and many of the  -ly adverbs formed from adjectives fit into this group.
Examples: angrily, cautiously, hungrily, nicely, slowly, deftly, precisely, unknowingly, loudly

5. Adverbs of degree
Generally, adverbs of degree describe the intensity of an action or quality. These adverbs are often used as intensifiers to describe adjectives and other adverbs.
Examples:  very, really, extremely, incredibly, too, quite, barely, deeply, fairly, greatly, hardly, highly, intensely, somewhat, totally, little, less, least, much, more, most

6. Adverbs of place
Adverbs of place tell us where something happens.
Examples: here, there, everywhere, nowhere, somewhere, anywhere, in, out, inside, outside, wherever, on, off, over, under, away, left, right, north, south, east, west