- My View
Take a look here:
True base tables are those that can be extended so you may want to filter on the "Extensible" field where value is true.
Custom tables are configured by customers and they typically start with u_
Please mark answer as Correct, helpful as appropriate.
1) Get a developer instance.
2) There's a bajillion tables. You can look at the OOB tables by going to Tables & Columns
Can't give you a list of custom tables, as that's dependent on the instance. If you're on an instance and need to find out what custom tables have been created...