At times when working with the terminal I need to repeat myself, thankfully other people before us, solved this for us.

For this, I will use an alias

In computing, alias is a command in various command-line interpreters, which enables a replacement of a word by another string. source wikipedia

To create an alias we need to edit the .bashrc or .zshrc depending on your configuration.

Syntax: alias <shortcut name>= 'command'
eg: alias cdDiathesea='cd $HOME/documents/projects/reacttoy'

Hint: alias shows existing aliases

now I'll remember how to do it next time.