There are 7 major chords: A, B, C, D, E, F, G. They can all be made a bit more "sad" sounding, e.g. E become Em. Some of the chords is easier to start with, for example Em.
If you like Taylor Swift this might be perfect for you. It uses chords Em, A and G. Pause the video and practice each chord. Move between them. It usually is a good idea to practice for a while and then continue the next day, to avoid pain in the fingers. When you master this skill, you might wanna continue with piano.
