Wall Switches

I just bought a new house. This is the first time I’ve owned a house so I’m able to make some changes to it, and one of the things I want to do are smart wall switches. But, I need some help…

What’s a good reliable brand for smart wall light switches that won’t break the bank?

Also, how do I do hallway lights that have more than one switch that can turn the lights on/off (I think they’re called 3-way switches)? I still want both physical light switches to work, but I’d like to automate them too… do they make switches to do that? How do they work?