Em
Standard022000
The quickest way to change chords in time: pick two chords, start the clock, and switch between them as many times as you can, tapping at every change. Do it every day and watch the number climb.
Or a pair to start with:
022000
x02210
Press Start: a count of four, then the clock runs.
Your scores show here after your first minute, kept in this browser.
Changing chords is the hardest part of starting out: each chord on its own is easy long before the move between two of them is. Short, timed, daily practice of just the move builds the memory in the hand far faster than playing songs and stopping at every change. The click helps once the change is quick: set a slow tempo and change on every beat, then speed it up.
New chords to practise are on the beginner chords page, in the order to learn them. Once a change is quick, play it with a strumming pattern.