One thing that you want to make sure is that you don't waste your time in the beginning by focusing on too many chords. (example for such unnecessary chords: C7b5, Adim7, Gmin7, E7, etc.)
What's cool about the guitar is that just 8-10 basic chords can get you to play tens of thousands of songs.
And then - once you can already play these basic chords and you can switch between them easily - feel free of course to learn more chords. But right now it will be a waste of your time and energy - and this is one of the reasons why so many people quit - they get overwhelmed without a real reason for it.
Focus only on the chords in page 3 until you can easily switch between all of them and easily play songs that use them.
Also - you should know that if for example you're playing a song and there's an E7 chord coming up - an E chord will work just fine as well. It will sound less colorful, but it'll totally sound "right". So don't worry about it. Same with playing an A instead of an A7, G instead of G/B, C instead of Cmaj7... You get the idea.
This attached E-Book will be very helpful for you (especially if you print it and place it right next to where you're usually practicing) because besides telling you which chords to focus on - I also added photographs - so it will be much easier for you to understand the diagrams when you have the pictures right next to them - to help you "decode" the diagrams.
Any office equipment store will gladly print and bind it for you for a few dollars - and I know that such a book was what helped me learn the basic chords much faster when I just started - so I highly recommend it.