No. If you must use target as a verb (not good usage, but some people do it) then the preposition is "to." Better to say aimed at, directed to, or intended for.
Yes
Yes, the sentence "He is their most targeted receiver" is grammatically correct. It means that he is the receiver who gets the most passes thrown to him by his team.
"Not like that" can be grammatically correct, depending on the context.
Yes, 'for free', is grammatically correct.
Yes! That is grammatically correct!
The phrase "You are not knowing" is not grammatically correct. Instead, you can use "You do not know" or "You are not aware."
Yes, Almighty God is grammatically correct.
"That was wrong" is a grammatically correct sentence.
Yes, it is grammatically correct.
'What a drunkard you are' is a grammatically correct English sentence.
Yes, "He sailed his boat on the river" is grammatically correct.
Targeted is the correct spelling.