Your comment about "...videos and books will show you depending on what headset, component set that you have..." is very true.

Campy lockrings and cartridge bottom brackets use different tool than Shimano and external bottom brackets use different tools than cartridge-type square taper and Octalink/ISIS use different ones altogether as do cup-and-cone bottom brackets. Cone wrenches are necessary for cup and cone hubs but cartridge bearing hubs need different tools. Headset wrenches are needed only for threaded streers but not for threadless fork/headsets. And so on.

If you give us a better description of the bike(s) you want to work on we can give more specific recommendations.