Ngons and triangles generally have a negative reputation among 3D artists. It's a divisive topic with strong opinions on both sides, some modelers support their use, while others oppose it.
While having triangles in your model isn't necessarily a bad thing, ensure their use is intentional rather than a result of poor modeling. Ngons can lead to a range of significant issues if not detected and addressed promptly, so it's best to avoid them. Either way, before you proceed to work on your model in ZBrush, you need to make sure your geometry is entirely clean.
If you get a pop-up message in ZBrush about ngons in your mesh during export, check out this advice from 3D Artist Braulio Flores, who demonstrated a quick way to fix faulty geometry in Maya with the Use Constraints feature.
Braulio Flores often shares insightful tips for working with various software, so check out his LinkedIn page for more educational content: