I am trying to bulk upload operations in the community edition of Odoo 11

Tried this approach:

1. Add a Odoo operation manually
   

2. Export an import-compatible CSV from Odoo operations

3. Add as many new rows (as new operations by copy-pasting the last row

4. Modified the details in the newly added rows

5. Used the new CSV file for import

These are the columns in the file exported in Operation 2 above:

id, active, show_entire_packs, barcode_nomenclature_id/id, color, use_create_lots, create_uid/id, create_date, default_location_dest_id/id, default_location_src_id/id, write_uid/id, write_date, return_picking_type_id/id, name, sequence_id/id, sequence, show_operations, show_reserved, code, use_existing_lots, warehouse_id/id

To ensure that Odoo does not run into inconsistencies later on, what all should I be wary of?

1. Are there particular columns which are unique apart from the first column named id

2. What are the minimum set of columns that are NECESSARY to be imported? (the other columns would take the default values if we leave them empty?) 
   

3. Are there any other special columns that I should be aware of?

4. What is the worst case in case something goes wrong? Can it so happen that the import happens smoothly now but causes some trouble later on?