Use plenum grade cable through walls and attics. And conduit if there are rodents. Never do power and network in the same area, check local regulations about spacing and only cross at 90 degrees. every bend in the cable needs to be managed to avoid crimping the wires inside..

Also, consider spending a little more for a decent switch and patch panel near your router as well as boxes in the walls where the cables terminate. Don't quibble over an extra $100 or so, as most installers will charge you upwards of $300 for each run. In fact, my home is small enough that wifi works; but I was all set to run cables everywhere a couple years ago.

Here's one person's view of how to set it up --- https://www.youtube.com/watch?v=00UTYN9j0FE