Won't write up a full article as others seem to have done a lot better than I could... however...
No matter the temptation to save money and use standard cable - DON'T!
A few years ago, I had to go to a school that had used standard cat5 cable all over the place and across flat roofs to go building to building.
They called me in after a lightning strike killed EVERY rj45 port on switches, routers, servers, desktops... and even fried IP cameras and print servers - Everything you can imagine!
Changing over 300 NIC's was a very long job and it was expensive to replace the other network equipment.
They are now using fibre optic... Not that much of a practical solution for home networking if you already have equipment, but certainly go proper - conduit, trench e.t.c.
(or if you do go cheap, remember my contact details for the future in case you have a big job coming!!)