PyMOL contains an overwhelming number of commands, so we recommend that you first learn the core set of commands and then expand outward from there as your needs dictate.
A complete alphabetical list of commands is also available, and the concept of a command is also discussed.
See also: http://pymol.org/pymol-command-ref.html
set | unset | get | set_bond | unset_bond | reinitialize | full_screen | stereo | button | mouse | config_mouse | feedback
align | pair_fit | fit | rms | rms_cur | intra_fit | intra_rms | intra_rms_cur | matrix_copy | matrix_reset
mset | madd | mdo | mappend | mview | frame | count_frames | count_states | forward | backward | rewind | middle | ending | mmatrix | mpng
remove | rotate | translate | drag | set_dihedral | edit | torsion | cycle_valence | alter | alter_state | fragment | bond | attach | h_add | h_fill | h_fix | fix_chemistry | redo | undo