It really depends on the type of stair if it's a long stair then no. I would always Ollie if possible

You can ride down 6 stairs if you do it right, if you are flying you can lift up or do an early grab and gap it, stylishly done if proper just sketchy. Or if you find that happy medium and try to a fire cracker, it’s scary to learn but once you got it, you got it. You basically lift a little like manualing last second, push down a bit, letting the tail slap all the stairs and useing that to balance. It sounds weird but once you land one it’s like a eureka moment, like a lot of tricks

Depends how much control of the board you have man I’ve ridden off four stairs On a light manual

Yes u can

Yeah, if your tail is hitting the steps it’s called a firecracker, very simple

If your going fast enough and then left up your nose a bit yes

Yes you need to be going fast and when you go down the stairs lift your nose of the ground a bit

U need to go faster and u do it