You will find training videos including how to get started using Eikon, and how to use with Microsoft Excel when creating analysis and models.
In addition there is training available for specific markets:
You can become certified in using Refinitiv Eikon. To become certified:
The exam is 30 questions long and you need to pass with 80% or higher. If you don't pass, you are allowed one additional attempt which you do not need to do immediately.