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Obviously START_PRINT and END_PRINT are like the core, most-used macros. Examples of those and some others can be found in the sample-macros.cfg in the Klipper docs. I made a guide that works with those sample macros and shows you how to configure your slicer to use them properly. You don't want to use mine, they are pretty bloated.
TEST_SPEED.cfg is a great tool for testing your speed/acceleration settings. See AndrewEllis93's Print Tuning Guide
I use mech_gantry_cal.cfg a lot, but that only applies if you use dual z steppers and dual z drivers. This macro will bump the gantry against the z_max to straighten it against the frame and eliminate any drift between the drivers.
ADXL_SHAPER.cfg runs all the resonance tuning commands for you, generates the graphs and saves the recommended shaper values to the config automatically. This requires the gcode_shell_command extension installable through KIAUH.