showing list of record on administration panel

Hi

1) You can show information about the person who created the record by using the createdBy pseudo fields. For example, if you wanted to display their user name, you would use:
createdBy.username

If you need information about the person who last updated the record, you'll need to use a front end page with website membership.

2) Required Plugins is if you want to make it mandatory that a plugin be activated in order to be able to view a section. Using custom plugins, it's possible to change the way a section/editor behaves, and you may want to always make sure that plugin is active before someone uses the section.

3) relatedRecords are a way of see a list of records from a foreign field that are associated with the record you are currently viewing.

For example, say you have a category section and a product section. Each product has a category. In your category section, you may want to have a relatedRecord field that will show you a list of all the products associated with that given category.

It's important to note that this field is for display only in the back end and having a related record field will not give you access to its list of records when using getRecords().

Hope this helps,