access priviliges

[yj-node]

hi there,

i am a linux-beginner, i would like to ask how to give certain user more privileges
and i heard an advice from someone that i shouldn't use Root for normal daily usage.
that the root should only be used for critical condition only.

so how to grant certain access to certain user, like using k3b, configure network interface, restart services, and so on and so forth

thanks for the help