Not yet. I just know “not flakes”. It’ll probably be a couple months before I actually get a fish.
Some flake food brands honestly aren’t terrible. Small pellets can work.
Frozen foods are optimal. Not brine shrimp, the adult brine shrimp have almost no nutritional value. Mysis shrimp is great. Variation is also good. If I were picking the ideal diet for a betta, I’d suggest alternated frozen mysis and bloodworms, with a feeding of frozen/thawed/peeled pea once a week or so to prevent constipation. Live treats are good for health but not required. Mosquito larvae are the best treats ever if you’re a betta. Put a bucket of clean water outside with some dry leaves in it, wait for mosquito larvae, pour larvae into betta tank, watch betta go nuts chasing the food.