I always set these because I’ve been burned too many times:

Turn on interactive mode for dangerous commands

alias cp='cp -iv'
alias mv='mv -iv'
alias rm='rm -iv'

I found a function version of this version somewhere. Same thing except it defaults to my local area but can be overridden if you specify a different zip code.

weather() {
 if [ $(command -v curl) ]; then
   if ! (($#)); then
     curl wttr.in/44113
   else
     curl wttr.in/$1
   fi
 else
   echo "curl not installed. Aborting."
 fi
}