Practice websites - how should I deal with them afterwards? - Joomla! Forum - community, help and support

i have several websites pretty similar content. created in course of developing 1 website use. practice websites. have different urls.

is best delete them hosting servers or not necessary?

is enough set global configuration of robots "no index, no follow"?

or late, have been around few months , have been indexed , followed ....?

if it's late, , going punished google though change robot configuration or delete websites, there recourse can take? ?contact google , ask them not recognize these websites or something

i have not "submitted" these websites google yet.

and if it's late, these websites still appear in search if searches using keywords in these websites? , if delete or unpublish articles or website happen. searcher message "this page not exist" or that? , how can change or prevent happening? or late?

i trying avoid being penalized google duplicated content.

i not sure best thing is.

just set them offline in global configuration. google can't index content requires login unless supply one.