How to choose a custom alias people will actually remember

A random six-character code works, but a chosen one works better. When someone sees a link ending in a word they recognise, they can guess where it goes before they tap it, and that guess is what makes them comfortable enough to follow it.

Keep aliases short, lowercase and free of numbers where you can. Numbers create ambiguity when someone reads a link aloud or types it from memory: was that a one or an l, a zero or an O?

Use hyphens rather than running words together. Two or three words is the sweet spot. Anything longer defeats the point of shortening in the first place.

One more thing: pick something that will still make sense in six months. Aliases tied to a specific date or a running promotion turn into noise the moment the promotion ends.