Some blender newbie problems https://www.youtube.com/watch?v=YuVJ7lP5Sfc&amp;t
At the beginning of the video you can see that he adds a lot meshes.
How does he do that so fast? Because when I add two objects and then press Ctrl+J and try to sculpt, they do appear as one object but I still got some sculpting bugs (they cant fully &quot;Connect&quot;).
In another section of the video (0:10), he somehow paints exactly on the mesh and turns it into a 3D object (the shoulder armor) and then adds a cylinder there.
Similar examples (1:48)
He is probably duplicating some objects with Shift + D in the beginning. You can also add objects quickly with keyboard - for example pressing Shift + A followed by M and M one more time will go through Add Menu then Mesh and then Monkey, you can type that quite fast. You can see the letters coresponding to the menu items in the menus underlined:

It's possible to create custom shortcuts for something that you do a lot as well.
If the object is constructed out of a lot of objects joined in sculpting, some sort of re-meshing is usually used to make a continuous surface that you can sculpt: