Whatever comes default with the current system.

i want serifs. I use Go Mono for monospaced text. i've yet to find a good proportional slab serif font to match though.

Anyone using Nimbus Sans?

It's actually preinstalled in a lot of systems. You can check via
gnome-font-viewer or find /usr/share/fonts -name "*Nimbus*"

Iosevka

Lato, League Spartan, League Gothic are my three most used fonts by a wide margin. Lato and its variety of weights for most things, League when I am doing design work and need a cleaner title or header.

Lately ive been weirdly taken with TT2020 Style G, which is an odd name for a no-name font that replicates an old imperfect typewriter. For whatever reason, switching my writing software to that (Manuscript) suddenly fired up my writing flow.

Poppins, RobotoMono, Comfortaa and OpenDyslexic

Biolinum O for desktop

Liberation Mono for terminal

Fira Code and Caskaydia Cove Nerd Font for monospace. For other uses, I'm usually good with whatever the system ships with.

Ubuntu Mono for terminal, code, and data, Open Sans for the rest

I don't have a favorite system font, am I meant to? I did try to play with fonts at one point but the process of finding fonts and then figuring out how to install them was a bit much.

I don’t have a reason to move away from the Fedora defaults except for monospaced fonts.

Terminal wise, terminus is my default. It’s so clean, and it looks good without anti-aliasing.

Roboto Mono is my current preference for monospaced fonts.

Adobe Source Code Pro and JetBrains Mono are good alternatives as well.

@SolarPunker I use Exo2 as desktop font and FantasqueSansMono in terminal.

I switched to Commit Mono for Terminal not too long ago but I really like it. Otherwise I use Cantarell but only because it is default and I never felt the need to change it.

SegoeUI, it’s damn good and well made

Pusab (I'm a gd player)

0xProto

Verdana, Tahoma and Source code pro is good for eyes

Inter everywhere

I mostly use an android, and the default font is Ideal Sans Light. On my system, Arial Nova, Courier Prime, Helvetica Neue, Ideal Sans Book and a few others are regulars.

Every once in a while I get this itch which ends up in getting a new favourite font.

VictorMono, has a cool cursive, mono spaced font.