I use fd to quickly find files by name. I find the interface easier to remember than find.

I use ripgrep to quickly find code on my computer. Unlike grep, ripgrep automatically filters out files that are ignored in VCS. I also use GitHub’s code search to look for examples of how to configure certain tools (e.g. setup.py, Cargo.toml) and find sample API usage. At Microsoft, I loved a tool called Research that enabled me to search huge quantities of code quickly.