NO
Sight is correct.
No, it is appalling grammar.
The word meaning "ability to see" is "sight".The word meaning "a place of land" is "site".The word meaning "to mention" is "cite".
"Your presence is always there and love" is not a correct sentence. You might write "you and your love are always here for me."
yes. with the correct screws yes. with the correct screws
Depends on the target. Generally, but not always, a telescopic sight.
It can be correct to say you are always welcomes. It is correct when finished with "in my home or at my place of business."
it is correct
It is 'you are always' and not 'you always' in a sentence for the purposes of correct grammar.
No, they are always incorrect.
he is stalking you
keep the victim in sight