IT questions answered in plain English
Short answers to common IT questions, each with the steps, the usual mistakes, and a free game where you can practise it.
All quick answers
What is a subnet mask?
A subnet mask is a number that tells a device which part of an IP address identifies the network and which part identifies the device.
How do you spot a phishing email?
Check who really sent it, where its links really go, and whether it is rushing you.
What makes a strong password?
Length and uniqueness matter more than tricky symbols.
What does a router do?
A router connects your local network to the internet and directs traffic between devices.
How do you build a PC step by step?
Check that the parts are compatible, install the CPU, memory and any M.2 drive on the motherboard, fit the cooler, mount the power supply and motherboard in the case, add the graphics card, connect the power and front-panel cables, then boot into the BIOS to confirm everything is detected.
How do you fix a PC that will not turn on?
Start with power and work inward: check the wall socket, the cable and the power supply switch, then disconnect extras, reseat the memory and test the monitor cable.