To my knowledge, OpenMPT still has some absolutely awful default keybinds which are very beginner unfriendly and generally unpleasant.
To help combat this I have decided to share my custom keybinds (and an included text file which describes what I've changed) in order to help people who want to start using the program. I also included my custom theme in case anyone wants to use that. The keybinds are tailored to my own workflow but they are general enough that others shouldn't have any issue with them.
OpenMPT has a steep learning curve even compared to other trackers, but it is very powerful and rewarding once you have figured it out.