You know those blue gel toilet bowl cleaner things you stick on side of toilet so when u flush its fresh and blue . Get one and Get him to aim for that . Better then cheerios this way it's already in the toilet for him when he needs to go .

Cheerios!!! I’m not potty training or anything but I’ve potty trained lots of little ones. I know this may sound weird but have a bowl or something of Cheerios by the toilet and every time he needs to go put one in the water and tell him to aim for the Cheerio. Or have little targets or marks in the toilet bowl and tell him to aim for it

All I can say is keep a bottle of bleach close by. Boys are not clean pee...ers

You have to keep reminding him to pay attention where he pees. Not much you can really do unless you get one of those potty things that stick to the wall for boys. My 5 yo still pees on the seat because he looks away or isn’t paying attention