For a long time, I’ve just put on DejaVu fonts and been done with it. Generally good enough Unicode coverage for me. But I know it’s been years since DejaVu’s been updated, and I wonder what’s very common today.
[As for the terminal, I’m guessing it’s usually still the standard fixed Unicode fonts?]
I have a weird selection- Jetbrains Mono with Monocraft and the bold Minecraft font. Jetbrains Mono is for everything except discord. Monocraft with Minecraft Bold is for Discord which i have IRCified with a custom Vencord theme.