All trainings should use official installation instructions for either developing a project or core software

[stevepiercy]

All trainings should point to the official installation documentation at:

https://6.docs.plone.org/install/index.html#install-plone

The trainings that need to be updated are listed below.

• https://training.plone.org/voltohandson/quickstart.html
• https://training.plone.org/voltoaddons/01-addon-basics.html#bootstrap-a-new-volto-project
• https://training.plone.org/mastering-plone/installation.html#installing-plone-frontend

For developing Volto core, see Develop Volto core.