Not smart, how do you do movement in JS Game dev?

Question

Can I have like basic sample code? I am not smart

Answer 1

I regularly use an explicit Euler integration scheme

position += velocity * time

The 1D solution has been provided by Mihaly

Answer 2

it depends on which movement:
X axis, Y axis
x+=1 or x = x + 1
x-=1 or x = x - 1
y+=1 or y = y + 1
y-=1 or y = y - 1