Drupal 8.x

Hi everyone !
I'm a beginner in Drupal 8 and I have already a little problem. I want to incorporate a "read more" in the text of my basic page. When I click on the "read more" link, I expect that the trimmed text will expand to full text in the same page (not in a new tab). I also want to have a link "less" that hides the entire text in order to have again the trimmed text. I prefer not to touch the code, I know there are Views but I don't know what features to use..
Thank you in advance for helping me.

I installed the Mayo theme, but I had moved blocks around and I got pulled away before I could rearrange things. Now my session has expired, and I can't get to the login form. Is there something I can do at the command line so that I can get to the admin pages and rearrange things, so I can login properly?

Hello there, at Drupal I'm looking for a sync key which is missing, where do i get that key , Any hint where to find that key would be nice.

Configuration directories : Not present
Your sites/drupal-8-3-3.dd/settings.php file must define the $config_directories variable as an array containing the names of directories in which configuration files can be found. It must contain a sync key.

Hello!
Please tell me how to disable the RSS?

I am looking to make a page using Views which shows an archive by date. What I am trying to achieve is an archive like this one: Ministry of Type. But I can not get my head around it ... Somebody here to help me out or point me out to a tut?

I´m on D8.3.3.

Hi everyone,