Say that you have a repetitive chord progression in your composition. Everything sounds good, but you want an introduction that is harmonically new… but at the same time leads into the main chord progression harmony.
Below, I have included a condensed “cheat-sheet” of options on what chords you begin a composition with and what are the best lead-ins before it:

Of course, these are just options that I have read about in discussion. They may or may-not work with your composition. Still, it is worth a try.
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