Keybinds:
With no items selected:
F1: Hides or shows the top menu. F11: Opens the Save Screenshot menu. F12: Opens the Debug menu. Q: Opens Sequences menu. T: Opens Tags menu. P,N: Previous and Next, scrolls the red highlight forwards and backwards through the list of images. F: Opens Filter menu. ?: Opens Search menu. C: Copies whatever image you're highlighting over into the clipboard. Prioritizes the highlight caused by the mouse, but if no image is being moused over, will copy the image highlighted using P and N. ESC: Closes whatever menu you're currently looking at. Left Click: Opens the file you've left clicked on. Right Click: Opens the file properties menu for the right-clicked item - you can change the tags here.
Shift-Left click to select an item, or CTRL-Left Click to bulk select items (click the image at the start and at the end of the section you want to select.) CTRL-A selects all items. CTRL-Q closes the application.
While an item is selected: ESC: Unselects all items. May need to be pressed twice because if it's closing a menu, it won't also unselect files. Enter: Opens all selected files. F2 or Right Clicking on a selected file: Opens the file properties menu for all selected files.
In the File Properties menu: You can right click on a tag and filter it out with "enable !filter". In the Tags menu: You can filter for files that exactly match a tag (as in, it has the tag, rather than something which implies that tag) by right clicking on the Check mark for the desired tag.