The Toolbar' purpose is mainly to assist text writing and editing that's why its resemblance with MS Word is not accidental,but because it is just this kind of program.
If you don't recognize some of the icons, hold down the cursor over the icon and the system will show you its functionality.

  - preview; 

- link insertion; 
- link breaking;

- inserting date;

  - inserting hour;
  - inserting symbol;
- insert / edit image;

- insert / edit table;

- clearing the code copied from an external text file;