Earlier quoted context omitted.
Bat is a cat replacement with syntax highlighting, formatting options; it works great with fd. What's rg?
ripgrep (the binary name is rg) is a faster grep written in Rust.
https://blog.burntsushi.net/ripgrep/ explains in detail _how_ it's so fast, and is a great reading on practical performance engineering.
The interface is nearly 1:1 with `ag` (and the older `ack`). One notable difference is that ag enables `--smart-case` by default, so it treats an all-lowercase pattern as case-insensitive, while `rg` doesn't, you need an explicit `rg -i`. (or set it in a config file, but I'd rather not learn defaults that won't work out-of-the-box on other machines).