For programming, my favourite is DejaVu Sans Mono. There are many fancy ones out there with hip features like ligatures but I have always found DejaVu the most pleasing to the eye.
For reading, I like Roboto for sans serif. I find it is decently condensed yet easy to read. For serif, I like a paid font called Century Supra. I have pirated this font many times. I also like the serif fonts used by imperialist news outlets a lot as well. IIRC NYT’s is straight up called Imperial.
Sans serif: Workplace Sans, Ubuntu, Open Sans, IBM Plex, Orpheus Sans (greek), Neohellenic Sans (greek)
Serif: Baskerville, Garamond, Times New Roman, Didot (greek) and Bodoni (greek)
Monospace: DejaVu Sans Mono, Ubuntu Mono, Fantasque Mono
Fixed: Terminus, Spleen
Decorative: too many to list here