I found an ideal learning wave at a beautiful location on a back beach!
Few surfers out and so I left the learners to learn and spent my time shooting them with a Canon

This sequence shows a common reason for failure and and how another surfer does it correctly.
I'll comment on each frame so it is clear.
Please click on the images if you wish to see them in more detail.
Small pretty wave for longboard, good paddle onto wave leaning forward for pop up Tick
Maybe needed one more stroke before standing but main problem stepped back in the pop up and stalled the board off the back of the wave FAIL

Next wave slightly stronger, two guys taking off ( drop in here doesn't apply they are friends and play at this) inside guy perfect take off line second guys looks to be coming off the wave in the same way as in the first two frames Tick.
Here outside guy has moved forward and dropped his board to engage the wave, both riding

Outside guy has pulled off

Here the wave has steeped and changed enough to allow a small turn , note the turn is based on leg drive and body torque not leaning and just how much of the board is free of the water ( lean and you would bog your rails) Tick.
Finally just a nice view of the same break from another angle. Tick