Practising chords and scales in the same order every day teaches your hands the order, not the shapes. A randomizer fixes that: it shows you something to play, gives you a moment, then shows something else, so each change has to come from memory. It is one of the quickest ways to make chord changes smooth and to learn the notes on the neck.
Choose what should come up: open chords, barre chords, power chords, scales, arpeggios, notes on a given string, intervals, strumming patterns, keys, or your own list such as the chords of a song. Mix them together if you like. Every item can be played on a real guitar sound, so you can hear what it should sound like before you try it.
Decide when it changes. On the beat uses a steady click and changes every few beats, which trains changes in time. Every few seconds is gentler. When I tap Next lets you go at your own pace. When it hears me play it listens through the microphone and moves on only once you have played the chord, the note, or every note of the scale.
In Advanced, choose No repeats to see everything once before anything comes back, or More of the hard ones to see the items you marked as hard more often. Your setup is kept on this device and the share link carries every setting, so a teacher can send a whole class the same drill.