Arial Rounded MT Bold was my favourite font for a long time when I was younger, and I loved to use it when making graphics.
Nowadays, my favourite font is Lexend, which is designed for readability. I am using it as the default font of my website (and hosting the font myself), and I have set it as the interface font and occasionally text font in Obsidian (the note-taking software), as well as the system font of my Android phone.
I also like Atkinson Hyperlegible, which I discovered alongside Lexend through this zine named The Accessible Design Survival Guide (I would recommend checking the zine out too as a beginner’s guide to accessible design), and I am using it as my main text font in Obsidian. I appreciate that it was designed with low vision readers in mind, which is relevant to me since I have both astigmatism and near-sightedness
As for monospaced fonts, for a while my favourite was Hack, and I had been using it as the monospaced font in the text and code editors I use.
Now I have switched to Intel One Mono, as I love that it was designed with low vision developers in mind. I am hosting Intel One Mono on my website as the go-to monospaced font, too.