if you do not know what mapping is, just ignore it.
Pick JSON or CSV format.
Select date range
You can also select which timeframe you are interested in.The default is "LIFETIME" to get all the data since the project was created.
If you need a custom timeframe, select "CUSTOM" and pick the start and end date.
Click on the project zip file to download it.
If you have more than one single form and branches, you will get separate files: one file per each form and one file per each branch.
How to merge the data (if needed) il left to the user. For example, using Excel, there are several ways to merge tables based on common columns (in Epicollect5, look at ec5_uuid, ec5_parent_uuid for child forms and ec5_branch_owner_uuid for branch forms), have a look at this link.
Checkbox questions can have multiple answers. Epicollect5 saves the answers to a question in a single column incsvformat like "one, two, three". If you need a column per each answer, It can be easily done in Google Sheets (see how) or Excel (see how).