If you have some distorded parts on your model, this tutorial help you to discover the optimization feature and get rid of the problem.
If you have to solve some overlaps problems, forcing the positions of some points, or straitening edges, look at this.
You need more rez on the noze, or on the more visible part of the model, look how the Density map help you to increase map rez on thoses important parts.
Use the TAB key to get the Gizmo. The Gizmo allow you to access to select/move/translate/scale without to change the editing mode. It save some time.
You have several islands which are similar, and you don't want to make several time the same jobs. Look at this HUGE time saver.
Shows how to hide/unhide polygons and islands. And shows also the auto-hiding feature.
Shows how to set up the symmetry.