I've finally taken some time to overhaul my dotfiles. I took a lot from git repositories and reddit posts that I've found and added some functions and aliases myself. I'm using Bash 4 and haven't tested any of this with any other shell. I've removed and redacted personal lines.
There are a lot of dotfiles that other's have shared that would be worth sharing here. But it's easy to find those and I don't know what you'd like or not. So I'll point out just one simple project, "Sensible Bash by Mattia Tezzele, that attempts to set saner Bash defaults.