Typewolf has an awesome curated collection of the 40 best Google Fonts:

https://www.typewolf.com/google-fonts

I set my body fonts to be fairly large (again, I use Medium as a guide). Between 17 and 21 pixels, depending on the font.

My favorite fonts are, Lora, PT Serif and Merriweather. I prefer serif fonts for body and sans-serif for headlines. The... See more