Why do i keep spinning props?

second one this month, the motor is a 50 hp johnson on a 17 ft carolina skiff also im a new boater ,,any help would be greatWhy do i keep spinning props?
I did that all the time with my 40 horse mariner. I sold that boat and bought a Mercury 150 with SS prop and never broke another one. Be extremely careful with that small prop......backing up around rocks and trees is an instant prop breaker.Why do i keep spinning props?
Sounds like getting in a bit too skinny water for the draft on your boat. Usually on take off, if you don't swing the wheel hard right or left to plane, you'll churn the bottom. If it's rocky, you spin a prop. What I used to do was get a prop with a replaceable rubber. You may have to dive and get your prop back, but then tip the motor up and remove the hub, install the new rubber, and your back in business. These also allow you to run a stainless prop with less risk to the lower unit. Unlike aluminum, stainless props don't bend up, they break gears. The twist apart type rubbers stop all that. Just keep a few handy and some tools.

Hope this helps, and good luck!Why do i keep spinning props?
When you say "spinning your prop" do you mean that the the prop is cavitating and losing water (spinning but not catching the water) or do you mean that you are spinning the hub on the prop ( hitting something and the plastic hub breaks to avoid gear box issues) I would assume you mean number one - because 2 is simple - your hitting stuff - if you are losing water - you most likely have the engine either trimmed too much or the engine was not mounted properly and should be lower in the water. A third possibility is that there is too much weight in the front of the boat and the engine is too far out of the water
The rubber hub will spin when the prop makes contact with underwater obstructions,this is help prevent serious lower unit damage.

now how old is your motor and the second prop installed was it a rebuild or new?