I want to add to the excellent advice you've already gotten.

Originally Posted by: matt88townsend

saying practicing chord switching without strumming will help you learn faster

Sometimes it's beneficial to only strum each chord once while practicing chord changes. Remove all the other elements: strumming pattern, strumming in time, remembering the chord changes of a song, the form of the song. And then you can keep the focus completely on the physical motions of chord changes.

For example if you are a beginner having trouble moving from a C chord to a G chord, then:

1. Fret a C chord.

2. Strum it once to make sure the notes are ringing clearly.

3. Fret a G chord

4. Strum it once to make sure the notes are ringing clearly.

Repeat as much as needed. This strategy can work for any skill level or set of challenging chord changes. Hope this helps!