When you go to Edit Mode, you can see a toolbar with many options to choose from. Every single tool allows you to do incredible things on your model; however, maybe there are a couple of aids you don’t know yet: The Shear and the Rip Region Tools. Do you want to know how to use them? Let’s begin!
You can access it in the left-hand toolbar on your screen board by its purple parallelogram icon; this tool works by selecting items along the horizontal screen axis.
Once you click on it, you will see a white square manipulator, which serves to askew your object in the direction you drag off the manipulator.
Basically, this tool moves your model in parallel, which means that the edges, vertices, and faces of a surface that is above and is aligned to one another, which is below, will move in the opposite direction to each other in the same proportions (Don’t forget that this maneuver occurs along the horizontal axis of the current view). Moreover, take into account that this tool also works depending on the location of the Pivot point.
All in all, you can set the Shear Tool by going to the bottom left-hand corner and changing the values and proportions.
Alright, you can find the Rip Region tool at the left-hand toolbar; it's the last icon you can see. You can identify it because its graphic representation is like a cube with a separated vertex (essentially what it does).
Thus, this tool rips polygons and moves the result, which means once you enable the aid, obtain the circle manipulator, and select a vertex with it; when you drag it out, you will separate the point and change the shape of the face creating sort of a hole on your model.
Note: You can't rip something that it’s not connected to anything.
Evidently, you can separate components according to the mouse pointer position and set the tool numerically and precisely by going to the little pop-up at the bottom and typing the values you need.
There you have it! Try them yourself and transform your objects into high-quality models! Good luck!