Old Geezer-Non-Techie Needs Help with Import

First, my apologies for the long request, but I don’t want to make a mistake and lose my Users Data.
I’m needing to add user data with lots of Rows. I have some questions regarding the Import Users From CSV plugin. It’s my understanding that the first two columns must be Username and Email. When I “exported” my users data, it lists them as “user_login” and “user_email”. So, do I use the latter for the Column Headers?
1. When I “Import” with this plugin, do I have to use all the same columns that came with the “Export” file to do the “Import?
2. I’m only needing to update two or three of the columns, so would I only use those Column Headers along with the Username and Password columns.
3. Can the “Import” file have any “Name” or does it have to be the same name that was used when Exported?
Exported Column Examples:
Exported File named: “carriagelifestyleownersclub.users”
ID|user_login|user_nicename|user_email|user_url|user_registered|user_status|display_name|roles|first_name|last_name|nickname|wp_user_level|member_number|membership|import_membership_id|

Can I just use the following columns in order to Import and will it leave all other column data that is shown in the Exported File as is without changing them?
Import File Name? Can I just name it “Import”?
Import Column Examples:
Username or user_name|Email or user_email|user_registered|member_number|membership|import_membership_id

https://wordpress.org/plugins/import-users-from-csv-with-meta/