Merge pull request AY2324S1-CS2103T-W08-3#200 from McNaBry/refactor-UG

Add misc segments for UG

docs/UserGuide.md

@@ -737,6 +737,17 @@ exit
 
 Exits the program.
 
+### Saving the data
+
+Jobby's data are saved in the hard disk automatically after any command that changes the data. There is no need to save manually.
+
+### Editing the data file
+
+Jobby's data are saved automatically as a JSON file `[JAR file location]/data/jobby.json`. Advanced users are welcome to update data directly by editing that data file.
+
+<div markdown="block" class="alert alert-warning">
+:warning: **Caution:** If your changes to the data file makes its format invalid, Jobby will discard all data and start with an empty data file at the next run. Hence, it is recommended to take a backup of the file before editing it. 
+</div>
 
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