Loop cut and slide:
Halving:
Use "Mirror modifier" (recommended Clipping)
Scaling the side face
Loop cut and slide:
Extrude "Z" lower face:
Loop cut and slide:
Loop cut and slide:
Inset face:
Inset face (without boundary) :
Inset face (without boundary) :
Extrude face:
Inset face (without boundary) :
Extrude Y faces