We are not usually notified by the company if new resources are available or added on the system. The fastest way to check is by looking at 'Date Added' or 'Last Updated'.
1) Log in to your account on the web (Currently, this is not available on the app)
2) Go to 'Resources'
3) Refer to the 'Date Added' and 'Last Update' column
4) Sort the desired column to see the results