Thread tension is something that should be discussed. This is how hard you pull on the thread after passing the needle through a bead that is already attached to the piece you are working on. It can be very frustrating to a new bead artist. The only way to learn it is by trial and error. Most likely, your first piece won't look like you want it to because it is either too tight or too loose. Stick with it. Thread tension is something that is developed over time and requires patience. Just keep at it. Remember that the tension for each piece is different.