Difference between these words
There are a few words in Polish that I don't know the difference between:
Ono and to Wiem and znam Dobry and dobrze
What is the difference? please help
dobry - masculine singular adjective 'good'
dobrze - adverb 'well'
wiem - 1st person singular of 'wiedzieć'
znam - 1st person singular of 'znać'
So the difference between 'znać' and 'wiedzieć' is more or less as between "to be familiar with" and "to have some knowledge". Grammatically, 'znać' is "to know X" and 'wiedzieć' "to know, that X", "to know about X" and similar.
I know that ono (it) is the pronoun for neuter nouns and that it's rarely used. However, I think I'd struggle to concisely describe to. We use to as a neuter personal pronoun (it) and as a neuter demonstrative pronoun (this or that nearby). And there's more in your superb guide here. I'm sure there's still more to to.