Why didn't Obi-Wan raise and train Luke?

It's a term for the universe that the SW galaxy is in.

 

If Yoda & Obi-Wan started to train Luke & Leia, then they could potentially be stronger, but then the Emperor probably would have "Felt" them sooner, and send his whole group of Hands, Dark Side Prophets, & Darth Vader himself after them.

 

Obi-wan, as has been said, goes off with Luke to watch over him, because he had no one else to watch over him. Leia was protected by an entire planet, as the daughter of the queen. Yoda had no reason to stick around, so he went to a location where the darkside hid his presence in the force. He hid until it was time to train Luke and Leia... though he only trained one.

The point that Obi-Wan did not have the means to care for a newborn child is also a valid one.

Obi-Wan could have raised Luke as the Jedi of old were raised, but that would make him into a Jedi of the old Order. We all saw where that order went. Something was wrong in the way the Order operated, so Yoda and Ben knew that something needed to change. Luke was brought up by good, honest people and had a morally sound character. This was important. When it came time for him to start the New Jedi Order he had all the right background to properly lead the order and make the right choices for the right reasons. This would not have happened if he was raised by Ben. If Ben raised Luke, Luke would have become another Vader/Anakin.