How to edit tags or file names of multiple files?
In order to edit a filename, please press the F2 key in the file view. After editing the file's name, press the Return key to jump to the next file.
For editing the tags, you can easily use the input fields of the Tag Panel. You change a title for example and then press the keys Ctrl+S to save the tag (or 
File > Save tag). After that Ctrl+N jumps to the next file.
If you don't want to manually save after each change you can enable the Save tags when using arrow-keys/single mouse click option under Options > Tags. It saves you from explicitly clicking the save icon or pressing the key combination to write the changes to the files.