I learned about eight parts of speech. They are:
Noun - the name of thing
Various types of noun include proper noun, abstract noun, common, and collective noun
verb - action of Noun or pronoun
pronoun - the replace of noun
adverbs - Words that describe the action or verb
adjective - Words that describe the noun
conjunction - of , on, in
prepositions - and , but, because
interjection- wow
And it is really important to know and able to identify the eight parts of speech because professionally speaking, it would be a great help for everyone.