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Theory:

Slide show shortcut keys:
 
Shortcut Keys
Effect
\(Esc\) \(or\) \(Minus (-)\)
End presentation.
\(Down\) \(arrow\) \(or\) \(Right\)
\(arrow\) \(or\) \(Page\) \(Down\)
Go to next slide
\(Up\) \(arrow\) \(or\) \(Left\) \(arrow\) \(or\)
\(Page Up\)
Go to previous slide
\(Alt+Page Down\) 
Go to next slide without playing effects.
\(Alt+Page Up\)
Go to the previous slide without playing effects.
\([number] + Enter\)
Type the number of a slide and press Enter to go to the slide.
\(Spacebar\) \(or\) \(Right\) \(arrow\)
\(or\) \(Down\) \(arrow\) \(or\) \(Page\)
\(Down\) \(or\) \(Enter\) \(or\) \(Return\)
\(or\) \(N\)
Play the next effect on the slide. If no previous effect exists on this
slide, go to next slide.
\(Left\) \(arrow\) \(or\) \(Up\) \(arrow\) \(or\)
\(Page\) \(Up\) \(or\) \(Backspace\) \(or\) \(P\)
Play previous effect again. If no previous effect exists on this slide,
show previous slide.
\(Home\)
Jump to first slide in the slide show.
\(End\)
Jump to the last slide in the slide show.
\(B\) \(or\) \(. (period)\)
Show black screen until next key or mouse wheel event.
\(W\) \(or\) \(, (comma)\)
Show white screen until next key or mouse wheel event
 
Normal view shortcut keys:
 
Shortcut Keys
Effect
\(Plus(+)\)
Zoom in.
\(Minus(-)\)
Zoom out.
\(Times(×) (number pad)\)
Fit page in window.
\(Divide(÷) (number pad)\)
Zoom in on current selection.
\(Shift+Ctrl+G\)
Group selected objects.
\(Shift+Ctrl+Alt+G\)
Ungroup selected group.
\(Ctrl+click\)
Enter a group, so that you can edit the individual objects of the group. Click outside the group to return to the normal view.
\(Shift+Ctrl+K\)
Combine selected objects.
\(Shift+Ctrl+K\)
Split selected object. This keyboard combination only works on an object that was created by combining two or more objects.
\(Ctrl+Plus(+)\)
Bring to front.
\(Shift+Ctrl+Plus(+)\)
Bring forward.
\(Ctrl+Minus(-)\)
Send backward.
\(Shift+Ctrl+Minus(-)\)
Send to back.
Reference:
https://documentation.libreoffice.org/assets/Uploads/Documentation/en/IG4.2/PDF/IG4212-KeyboardShortcuts.pdf