New knitter: Adding thread to scarf?

My very first knitting project ever and I have some beginner questions about my scarf. I am through my first roll of thread and ready for my next. Do I just tie the ends together in a knot and continue? Help please!

What I do is just start knitting with the new color or skein leaving a 6"+ tail. It’s okay if it’s a little loose at the join because you can go tighten up those stitches and weave in all the ends when you’re done. If it bothers you knit an inch or so then weave it in.

You can also overlap the old and new strands for one or two sts. Those stitches will have a double thickness but it won’t be noticeable.