Ok- night times, I'd put a nappy on him until he's dry at night, it's all to do with bladder control so apart from waking him in the night for a wee there isn't much you can do. I did this with mine and eventually they were dry at night
my daughter was much quicker than my son.
Out and about, well, we had a few accidents but little boys are easier than girls, web had ewes in pop bottles, and even a crisp bag once when we were in the car. They do get better holding it pretty quick.
I'm sure the girls on here have loads of advice, my older two are quite old now so it's a distant memory. I've got it all to come again with Ellie
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But don't stress, hes only 3 and he will get the hang of it in his own time.
Good luck xxx