How to use Plone CMS online

i am writing this mail to understand some details about plone, i am interested to use plone CMS once.

  1. is it necessary to install and set up on my local system to use it, is it not deployed anywhere yet ?

  2. i am setting it up inorder to understand it for making contributions to it, so what installation method shall i prefer, through containers or packages.

  3. i tried use it using the option given on official website, screen shot
    Screenshot from 2023-07-22 16-41-26

  4. is provided in attached file, please take a look, i will be very grateful if you please comment on whether it is write way to try plone CMS or not .