Add initial tips section

docs/advanced/index.md

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 command_line
 omero
 view_tracker
+tips
 ```

docs/advanced/tips.md

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+(tips-and-tricks)=
+# Tips & tricks
+
+This page contains a (growing) collection of tips & tricks that can help make life with QuPath more pleasant.
+
+Some of these are always applicable, while others depend upon which specific operating system you are using.
+
+
+
+## macOS
+
+### Conflicting shortcuts
+Some of QuPath's shortcuts conflict with built-in shortcuts in macOS.
+
+In particular, the handy shortcut to select all detections is {kbd}`Option`+`Cmd`+`D`.
+On a Mac, this tends to show or hide the Dock... leaving the detections just as visible as they were before.
+
+In cases where you don't use the macOS shortcut and want to turn it off, you can do so system-wide under {menuselection}`System Settings --> Keyboard --> Keyboard Shortcuts`.
+For example, unchecking {guilabel}`Turn Doc hiding on/off` can enable QuPath's shortcut to function as expected.
+
+
+### Lost windows
+QuPath doesn't play entirely nicely with multiple monitors on macOS.
+For example, when dragging a (sub)window (e.g. the Brightness/Contrast dialog) to a different monitor, it might become 'detached' from the main QuPath window.
+
+The {menuselection}`Window --> Center all windows` and {menuselection}`Window --> Center off-screen windows` were introduced in QuPath v0.6.0 to help find windows that might have gotten lost.
+
+The problem is [described on GitHub](https://github.com/qupath/qupath/issues/1785) and is not something that can be fixed entirely within QuPath, since it [relates to JavaFX's behavior](https://bugs.openjdk.org/browse/JDK-8252373).
+
+Nevertheless, there is a macOS system setting that can *influence* the behavior, and so may be worth trying if you find it too annoying.
+It is found under {menuselection}`System Settings --> Desktop & Dock --> Displays have separate Spaces`.