I am going to install SharePoint server 2013 on the PC which is connected to LAN of my college. If I create a website or system on this PC using SharePoint Server 2013. How can I access this website from other PCs of the same LAN connection? Can users working on other desktops in the same LAN connection, access this data?
Yes... If all your computers are connected via LAN it is possible.
Say for example.
One of your PC has SharePoint installed and its hostname is "sharepointserver" and its IP address "192.168.1.2".
Assuming, you have created on a web application and at least site collection at below URL
Other computer can access it via below 2 options