I've created lessons in the past on the C Major and D Minor chords for guitar. Now, it's time to practice strumming between these chords. These are beginner guitar chords, but it's important to feel comfortable with them, as they appear over and over again in popular songs.
Take your time with this exercise and make sure you can strum between these chords easily. These are the popular open position chords, however note that there are many other ways to play a C Major or D Minor chord on the guitar fretboard.
Start with the basics, build a strong foundation on this knowledge, and continue to improve your musical vocabulary steadily over time.