Select the block in your hotbar
Move to the location where you want to place it
Aim at the face of an existing block or the target placement spot
Right-click on PC or use the place button on console/mobile
Repeat to place more blocks
Use the correct tool if the block requires one
Sneak/crouch near edges to avoid falling off
Rotate your view to place blocks in different directions
Break and replace blocks if you place them incorrectly