Is it bad to copy and past code from documentations websites?

Question

I'm lazy in memorizing codes. So i learn the syntax and read through documentations, when i want to built a site or an app. I find it easier, faster and convenient to just go and copy and past from sites like bootstrap.com, w3schools.com and stackoverflow.
I'm wondering if it's bad habit for programmer.

Answer 1

If you acknowledge the source it's OK.