KDE navigation shortcuts

The Go Menu

Go → Previous Page

View the previous page of the document.

Go → Next Page

View the next page of the document.

Go → Beginning of the document (Ctrl+Home)

Go to the beginning of the document.

Go → End of the document (Ctrl+End)

Go to the end of the document.

Go → Back (Alt+Shift+Left)

Go back to the previous view of the document.

Go → Forward (Alt+Shift+Right)

Move forward to the next view of the document. This only works if you have already moved back before.

Go → Go to Page... (Ctrl+G)

Open a dialog which allows you to go to any page of the document.

Source: https://docs.kde.org/stable/en/kdegraphics/okular/menugo.html