If a police officer never pulls you over with sirons and all, so you get out of your car and proceed to your back porch, and five minutes later the police officer comes in back of your house, and arrests you and tows the car as well as searches it without consent or me even knowing, how is that legal?

The police followed you home? Then his statement to the DA that he then arrested you for driving without a license will hold up in court. I assume that they knew your license had been suspended? Or is there more to this story, a history of drugs perhaps, stolen goods, what? With an expensive lawyer, you might be able to fight the car search, but I doubt it. And certainly not the tow.

Even little old ladies driving without a license can have their car towed.
I once had to walk home in the dark on a snowy winter night because I got stopped for speeding about 2 days after my license had expired. The cop took my car keys. He graciously didn't tow the car, the creep.

As long as the officer observed you driving the car, he can do what you describe.