whats the common amp?

whats the best bang for buck for dac/amp for earphone and headphone

handphone/mobile devices

hi all, tumpang thread. im looking for "entry level" and "best bang for buck (bbfb)" for dac/amp and headphone/earphone for:

-mobile devices (handphone) - handheld form factor, small and compact. I read got people recommend dongle? but what brand?
-desktop/laptop - compact form factor, easy to carry, sturdy and easy to put in bag
-headphone/earphone - how to choose?

As i know "entry level" may not equal to bbfb. My requirement is low. I just need it be plug and play and to outperform onboard sound of desktop/laptop/hp (mobile devices) noticeably. Meaning to say if i unplug from dac/amp and plug back to ori source, i immediately know the difference.

I read all info here, i m just confused what should I be checking? specific dac chip? interface? internal circuit build? brand? how to judge and choose? I know ohms on amp->headphone but how about ohms on dac/amp->headphone? Thanks for info here, i m checking on brand topping/smsl and fiio if anyone willing to share their recommendation or preference.

tldr; looking for "entry level" and "best bang for buck (bbfb)" for dac/amp for headphone/earphone based on brand.

any help Bonchi azbro zerorating munak991

zerorating munak991 appreciated your contributions. especially munak's post holy shit, let me digest.