Ccna ka topic switch or router

Sir/madam,
Switch aur router me secret password ko remove ya reset kaise kare.

School organization me office, lab, library etc alag alag hai sab ko ek sath lan network with internet sath kaise kare. Sab me file sharing and printer connect ek computer se ho aur kisi bhi pc se print kare print out de.

Give me complete details

Thank u