I've hunted boars (the razorback "European" kind and not the feral pig kind) in North Carolina for a few years now. Look for trunks low to the ground where they would have rubbed themselves. Their scat looks like human scat. In the fall, they tend to gorge themselves on acorns, so any expanse with oaks might be a good spot to start looking. They tend to travel on "highways" to and from their nesting areas, meaning along long corridors that branch off from the center trunk line to separate areas. If you're lucky enough to stumble upon one, you'll be watching them dart in front of you from left to right and right to left all day long.
They've become nocturnal due to hunting pressure, but that doesn't mean they sleep during the day. Find the most inaccessible area of the forest that's overrun with bushes and impassible thickets, and go deeper into that. That's usually where they nest.
You could always try baiting them, but I never have.
DO NOT AIM LIKE YOU WOULD ON A DEER OR MOOSE. Sorry for the caps, but if you're a humane hunter, this is important. The boiler room isn't like on the ungulates, and if you shoot one there, you'll just end up gut shooting it. Their vitals are in front of their front leg, in the area between their shoulder blade/armor plate and their elbow and low to the ground. Picture a human down on all 4s and you get the idea.
Best place to hit them is usually the neck. I've used .223 JSP like many, many other hunters do. I've seen them dropped with .44magnum handguns too (in the US). Shot placement is everything like all animals.
Their tracks look very similar to deer, except they're rounded instead of pointed. Boar look like a single hoof with a crescent moon at the top whereas feral pig and deer are 2 distinct hooves
One last thing: if you're going to be hunting them in the US, you may want to wilderness carry. I always had a .45 on my hip (at the time...now it's a 10mm) incase my AR jammed after the 1st shot and it didn't drop. Boars WILL charge if wounded and p*ssed off. Feral pigs I don't know about.
Good luck