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By default, the first user who creates or opens an item, owns the lock on this particular item and can edit it until he unlocks it, generally when closing and/or saving the changes made. When the Lock is removed from an item, the changed item gets committed to Git.
Also, you have the possibility to log information about the changes you made on any item, on the condition that the relevant option is selected in Talend Administration Center. Check Talend Administration Center User Guide for further details and read Logging information on edited items.