For the Unit 1 discussion about Part of Speech. I relearned the 8 parts of speech and now understand their differences, especially adverbs.
The example I can share is from the irregular adverb.
The early bird gets the worm. (adjective)
He always arrives early. (adverb)
Irregular adverbs do not follow the -ly rule. But the difference to the adjective is that they appear before or after the verb.