Weight Bearing as Tolerated
If you are weight-bearing as tolerated, that means you can put as much weight through your leg as is comfortable. Putting weight through your legs should not significantly increase or cause you pain.
Partial Weight Bearing
If you are partial weight bearing then you can put some weight but not all through your leg. You should push through your hands on the crutches to keep the full weight off of your leg.
Toe Touch Weight Bearing
If you are toe touch or foot flat weight-bearing, then you may simply rest your foot on the floor. Imagine there is an egg or a cracker under your foot that you don't want to crush. It is important to allow your entire foot to rest flat on the ground.
Non Weight Bearing
If you are non-weight-bearing then you can't put any weight through your foot. You should push through your hands on the crutches to keep the weight off of your foot.