But you just had to write a detailed guide.
after all, there are a lot of settings that it's better not to touch without knowing
There are plenty if you look but the basic things are
Hold C for the radial menu in which you can change settings like rotation angle, movement precision, texture size and more.
While having the magnet tool active, which you do with the return key, you can du these things
Ctrl + arrow keys or pgup/dn you rotate the block
Shift + arrow keys or pgup/dn changes the size of the block
If you hit ctrl key the block you have active currently will be locked in place but not fully set. That allows you to move or rotate it before placing it finally.