To share Looker Studio, click on the Share Button or Arrow within the Share button. It's located in the top right corner or Uses the File > Share menu option to invite other people to view or edit your report. A detailed explanation with pictures here
Manual Publishing activates the draft version setting, so you work on the draft version while viewers are viewing the published report. A detailed explanation with pictures here
Version history lets you view and restore previous versions of a report or data source.
Looker Studio keeps a history of your changes in a report or data source. You can also save, view, restore and delete previous revisions of your report. You can also see the timestamp and the editor of that version. A detailed explanation with pictures here
Use the embedding function to showcase your best looker studio dashboard on your website or blog, and it will be working as a regular dashboard and can access most of the view mode functions. A detailed explanation with pictures here
Use the Get a link to this report option to generate a short URL to your looker studio reports. A detailed explanation with pictures here
Use the Schedule email delivery function to share your PDF report automatically by email at a custom-defined time. A detailed explanation with pictures here
Use this option to save your report in PDF format for offline access. A detailed explanation with pictures here
This will help you to find the features you are looking for. Most of the features only visible in Edit mode. A detailed explanation with pictures here
List of Windows and Mac Keyboard Shortcuts for Looker Studio. A detailed explanation with pictures here
You can use this to select a preferred design for your reports using predefined color schemes. There are 21 predefined themes available, and as Google describe, the color schemes of these themes are set in a way that is attractive and suitable for colour-blind users.
Suppose you are just starting with Looker Studio or quickly want to build a visually appealing and uniform design report. It would be best if you started with an available theme. A detailed explanation with pictures here