Circular knitting

I’m about to start my first ever circular project.

I’ve adapted this:
So that the ribbing rows at the start are on straight’s, so I can put a split with button holes.

I’m about to transfer to circular’s, and I was wondering if anyone had any tips about it - How do I make sure the first join is strong, and are there any traps I can fall into?

Thanks :hug:

Knit the last row flat with the circular needles, then keep knitting and start the next row in the round. Just make sure the first few stitches are a little bit tighter after you join.