Show a Welcome screen after logged in

What would a simple way to show a Welcome screen after logged in? Just some plain html + a little bit Javascript

How about the Welcome dashboard…? Or just set the landing page to any custom of your choice.

I went to
Settings > Administration > Theming > Welcome widget
but there was no Welcome widget

Sorry I meant the dashboard welcome widget.

Using the collectives with circles, provides you an intranet-like experience. You make markup based pages. By using that, with the combination of this in config.php:

'defaultapp' => '[appname as shown by occ app:list',

will definately solve it for you. But the requirement is to then enable and configure circles aswell as collectives.