Convert landline to Ethernet connection
 

I live in a 1990's townhouse. There are 5 (perhaps 6) phone jacks throughout my home. I want to convert all but one phone jacks to Ethernet jacks. I checked the phone box on the outside wall and found Ethernet cable is used for phone connection. So technically I should be able to convert. But I have no idea where to start. In the meantime, I also found there is one telephone box inside my garage. Two phone lines are connected to the box in the garage, the grey one goes to a phone jack in the garage, the blue one (cat5e) goes up through the wall/ceiling, and runs through the exterior wall, all the way to a room's outside and then drills through the wall to a phone jack.

Any information on how to do this landline to Ethernet line conversion?

Thanks!

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