Another decoupling question...?

hmm..good to know.. (still learning it all I guess)

on this project.. (which is based/built form the SECOND image)..

there is no Electrolytic caps even being used (guess that is in incorrect).. I didnt see any +/- in the schematics..where others 'did' have it

here is the board made from it:

I havent had 'any' problems with anything so far with it.. as far is it not working/flashing bootloader/loading a sketch/playing audio..etc..

and again.. no electrolytic caps were used?

(elec caps are SO big!.....how to keep small footprint down when I see boards like/similar to this then)?

I am basically still learning.... I looking at open source schematics.. read, copy..trying to understand and implement into my own boards..etc

so thanks for the help/feedback..

Im sorta wondering why when I posted the first (full) schematic for review here, everyone said it was 'ok'??

take care

thanks!