This is the 150th most frequent Bulgarian word.
сега
"Now."
In this sentence, 'сега' is used to mean 'now', indicating the current time as an appropriate opportunity.
Сега е добър момент да започнеш нов проект.
Now is a good time to start a new project.
In this usage, 'сега' refers to the temporal point at which an action (explaining) is occurring, leading to clarity.
Сега, когато го обясняваш, всичко има смисъл.
Now that you explain it, everything makes sense.
Here, 'сега' emphasizes the preference for the present moment over a subsequent time, as indicated by 'instead of tomorrow'.