Which keyboard size?
Smaller boards drop the number pad, then the navigation keys, then the function row and arrows. Switch between the sizes to see what goes.
Size questions
What does 60% keyboard mean?
A keyboard with roughly 60% of a full-size board's footprint: just the main block of letters, numbers and modifiers. Arrows and function keys are reached on a second layer, usually by holding Fn.
What is a TKL keyboard?
Tenkeyless: a full-size layout without the number pad. It keeps the function row, navigation keys and arrows.
What is a key unit?
The width of one standard letter key, 19.05 mm (0.75 in) from the centre of one key to the next. Bigger keys are measured in units: a standard space bar is 6.25 units.
What's the difference between ANSI and ISO?
Mostly the Enter and left Shift keys. ANSI, common in the US, has a wide, flat Enter; ISO, common in Europe, has a tall Enter and an extra key next to a shorter left Shift. The drawings here are ANSI.