CSS Grid worth it if I know flexbox?

I cannot recall many concepts from CSS Grid, but I don’t see much of a need to learn it given that it’s similar to flexbox and I know flexbox well if I say so myself, so what would you guys recommend? Do I return to grid? Or do I proceed with where I am

They’re two different things, one does not replace the other, grid is for fixed two-dimensional grids, flex is for laying things out in a line and allowing the elements in that line to fit to the size (one-dimensional). Some of the usecases overlap, but both are used

I would say yes. It can help with laying out a website. Also if you learn to use bootstrap it will help you understand it better. Don’t take short cuts now and kick yourself in the butt later.