You can create an alias with the alias command:

alias alias_name="command_to_run"

Example:

alias ll="ls -la"

Persistence

For persist the alias you need to add it to your .bashrc file:

vim ~/.bashrc

# Aliases

# List files
alias ll="ls -la"

# Get my public IP
alias myip='curl ipinfo.io/ip'

Remove an alias

# Remove an alias
unalias <alias-name>

# Remove all alias
unalias -a