Some Songbook pages stay on four chord names. The table can still run for many bars. Your hand only has to learn four grips.
Four names is a practice size, not a prize. A page with three names is smaller. A page with five asks for one more grip.
Open one page and play it slowly. Then open a second page that reuses three of the same letters. The new letter is the only new work.
Auld Lang Syne uses G, D, Em and C. That is the whole set on the page. The tune you already know rides those four.
Ode to Joy uses C, G, Am and F. Am is the minor colour. The other three are major.
Simple Gifts uses G, C, D and Em. Em is the only minor name in that chart. Keep it for the bars that ask for it.
Doxology (Old Hundredth) uses G, D, Em and C, the same family as Auld Lang Syne. A hymn page can be a four-chord page.
I've Been Working on the Railroad uses G, C, D7 and A7. D7 and A7 are not plain triads. They are still only four names to find.
Whiskey in the Jar uses C, Am, F and G. Shenandoah uses those letters too. Play one, then the other, and notice the shared pad.
Waltzing Matilda uses C, F, G and Am. The order is not the same as Whiskey in the Jar. Read the table. Do not assume the loop.
Jingle Bells is not a four-chord page. The chart uses G, C, D7, G7 and A7. Save it until five names feel ordinary.
Open The Four Chords with no tune in mind. Hear the four chords as a wheel. Then put a song on top of a similar wheel.
Four Chords, from vi starts on the minor chord of that same family. If a song feels like it begins away from home, try this order.
Stay in C major for one sitting. Move to G major the next day. The loop shape stays. The letter names change.
The Chord player online puts the pad in front of you. Tap the four names only. Leave the rest of the Songbook closed for that sitting.