@Boldline If the document is in CMYK color mode, it's best for the text color to default to standard 100K black (C0 M0 Y0 K100), so you only need one plate β the black plate (if it's only text).
Otherwise you would get 4 plates just for black text β much higher cost, possibly having to remake the black plate because the text is not at 100% black, and also registration issues nobody needs ("ghosting").
If however you want a darker black for text intended for print, and if that black text sits on some other lighter colored objects, setting the fill of that text to overprint will make it darker because it will be combined with the colors under it.