Clearing all cached app data on Android?

To clear your app cache data, go to Settings, then Storage, then Apps. Select each app and then tap Clear Cache.

oh...do I really have to do it one at a time? Is there any way to clear ALL of the cache data at once?

Yeah, it looks like you can only clear individual app caches. I would say focus on clearing data for the apps you use the most, like YouTube, Instagram, Facebook, things like that. They tend to have larger caches anyway.

what about clearing the cache that's not for apps

Open Chrome, tap the 3-dot menu, then tap "Delete browsing data" and select the timeframe from the drop-down menu (last 15 minutes, last hour, last 24 hours, last 7 days, last 4 weeks, or all time). It will clear your cookies, cache, and other site data, too.

If you just want to clear your cache, then select "More Options" from the "Delete browsing data" menu and uncheck everything except for cached images and files.

U don't want to delete all your apps, cause U would have to start from beginning with nothing to get stuff going with again. That be so long to do all over again.