Convert landline to Ethernet connection

[wireless]

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!

https://bhzof35755.i.lithium.com/t5/image/serverpage/image-id/8708iA6B798A2AE0F7E26/image-size/large?v=1.0&px=999https://bhzof35755.i.lithium.com/t5/image/serverpage/image-id/8710iB6BC7995DCBE5A09/image-size/large?v=1.0&px=999https://bhzof35755.i.lithium.com/t5/image/serverpage/image-id/8711iF9F0290A895F7CDB/image-size/large?v=1.0&px=999https://bhzof35755.i.lithium.com/t5/image/serverpage/image-id/8709i3871696A2EC84CA7/image-size/large?v=1.0&px=999


More... (https://forum.telus.com/t5/Internet-TV-Home-Phone/Convert-landline-to-Ethernet-connection/m-p/95575#M20887)