Accents matter.

Take the time to learn Greek accents.
Just at a basic level of grammar, the nature of Greek propositions is predicated on its accentual system: the move from old/assumed topic to new/asserted focus wholly relies upon accentuation. If you don’t learn accents, then you don’t learn the basic language internal structure for interpreting and understanding Greek sentences.
The text of the NT (and any ancient Greek document, really) was written and intended to be an oral text, to be read out loud. Reading in the ancient world was often a community activity. As such understanding and interpreting the New Testament according to authorial intent presumes reading out loud in Greek, which in turn presumes the prosody and cadence of Greek. The flow of information word to word, phrase to phrase, sentence to sentences is predicated not merely on lexical content, but also on the language’s prosody. Its prosody is predicated on its accentuation system.
Good for the basics of lexical accentuation

Advanced issues in accentuation & prosody:

Linguistics & typology of prosodic/intonation systems