Is it okay to copy paste code while learning from online tutorials?

The other day I posted a couple of links for learning NodeJS. I was wondering, what is the best way to maximize my knowledge?

If I just copy paste code from online tutorials, I feel like, I won't be able to write them myself if I had to start again without googling?

Say for example, if I follow some tutorial, how do I ensure, I can code everything from that tutorial without looking up online for code snippets?