This crochet tutorial is for making an increase (inc). If you want to make an increase, just make two (or more, depending on your pattern) stitches in one stitch of the previous row.
This is a crochet tutorial for connecting with a slip stitch. A slip stitch is used very often. When you work in rounds, often you have to connect the end of the round to its beginning.
Here it is shown how to make a magic ring or an adjustable ring. As its name says, you can adjust the hole that is in the middle of your first round.
This crochet tutorial shows how to make a chain (ch). It includes detailed photo instructions and a video tutorial.
This crochet tutorial shows how to make a slip knot. This is a beginner friendly tutorial that includes detailed photo instructions and a video.