Please start creating a sample project and try and you will end up learning it.
Your requirement is to see the created records by logged in user. Have an attribute CreatedBy and add a microflow for save process. created by is set to the current user. Then have a datagrid and retrieve from xpath with createdby as currentuser. I hope this helps
Go through Mendix documentation about Microflows
Also if you are completely new to Mendix, you should try exploring some beginner level learning paths in the Mendix academy. They will help you to build your own applications.