From LedHed's Wiki
Overview
I started using OpenBSD and found that some of the command aliases I'm used to using in other distributions weren't there. Naturally I went looking for ~/.kshrc but was surprised to find it wasn't there. There was .cshrc but edits to that file weren't working (probably because the default shell in OpenBSD is ksh).
How to add Aliases
Edit ~/.profile and add:
export ENV=$HOME/.kshrc
Now create ~/.kshrc
alias ll="ls -lsah" alias service=rcctl
References
https://unix.stackexchange.com/questions/476065/openbsd-how-does-one-set-an-alias