Try a whole bunch of song starters, look like a pro fast.
Most of these songs use a combination of G, C, and D or A, D, and E.
"Three Little Birds" – Bob Marley
Chords: A, D, E
"Leaving on a Jet Plane" – John Denver
Chords: G, C, D
"Bad Moon Rising" – Creedence Clearwater Revival
Chords: D, A, G
"Free Fallin'" – Tom Petty
Chords: D, G, A
Someone Like You" – Adele G, D, Em, C - The ultimate "4-chord" progression. Very emotional.
"I'm Yours" – Jason Mraz G, D, Em, C - Uses a "reggae" style strum where you accent the off-beat.
Riptide - Vance Joy: Perfect for the D - D U - U D U pattern.
Perfect - Ed Sheeran: Great for learning to count to 6 instead of 4.
Shake It Off - Taylor Swift: Only three chords! Focus on keeping the energy high.
These are challenging as they require the index to press all strings
Top 2 strings running over a lot of bass