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Input and Axis Actions are now deprecated and we can expect them to be removed entirely at some point. This video covers the basics of switching to this new system. Triggers within Input Actions act as conditions for allowing the action to execute. For instance, the 'Hold' trigger will only allow the action to occur if the key is held for 0.5 seconds which could be useful for a restart game button, as an example; some function you wouldn't want to execute by accident. Extra context to the action event node: 'Triggered' is the primary execution pin, this is always what you should use for the main action. 'Ongoing' is used only during the pre-trigger period ( the 0.5 seconds ), the confirmation stage. 'Started' is self-explanatory but a key to note: it executes when Ongoing does, not Triggered.
