"Viel" oder "Viele"? Gute Frage!
It depends on whether or not you're speaking about something that can be counted. For example:
viel Zeit - lots of time. Time in general cannot be counted. (You can count hours, but not time itself.)
viele Menschen - many people. People can be counted.
Erfolg (success) is another example of something that cannot be counted. Certain things, yes, like finishing a degree or obtaining your driver's license, can be counted, sure, however they are very specific events. But the notion of success is not countable. Thus when we wish someone success in German, we say "Viel Erfolg!"
So when you are unsure, be sure to ask yourself the question if something is countable or not:
Ist die Sache zählbar? Oder unzählbar?
The trick is knowing which things in German are countable or uncountable as it differs from your native language.




