if it worth it will try it with my friend, but the question is if i use delegation to borrow a friend steem power , and with that steem power he upvoted to me that normal or will make an issue ?
You can do it, but giving self-upvotes don't make you attractive on the platform if you don't receive much from other users. Try getting upvotes which come naturally but self-upvotes can also be used.
That would be beneficial for you as well as for the community.
But choose wisely.
Good Luck
if it worth it will try it with my friend, but the question is if i use delegation to borrow a friend steem power , and with that steem power he upvoted to me that normal or will make an issue ?
You can do it, but giving self-upvotes don't make you attractive on the platform if you don't receive much from other users. Try getting upvotes which come naturally but self-upvotes can also be used.
i heard that direct self vote (non delegation) go to rewards pool in latest update HF20