no it is not true
An LCD is an elaborate, electrically controlled color filter. The light comes from either a florescent tube or a bank of LEDs. A plasma TV set generates light much like your old CRT Television; a phosphor is activated and emits photons of a specific color. The advantage of an LCD is that they use much less power than a plasma and do not suffer from image burn in as plasmas may. The advantage to plasmas is that they have much better response times (for showing fast moving object), better performance at extreme viewing angles and are generally cheaper than LCDs in comparable sizes.
Generally, you can't, unless you have a router or a switch to control the network. Any time two or more computers are linked together, it is considered a network, which requires that every device have addresses unique to that device. These addresses are used by the router or switch to control where data flows.
You can't use a USB port to network two computers unless you have an USB/Ethernet dongle connected to it. You can't network two computers with just a USB cable.
Knowledge is something you know. Knowledge base is where you go to get the answers to things you do not know. Like a dictionary, a support link on a computer.