There are such institutes that have long proven their reliability through their knowledge and experience.
As a food forest enthusiast it is definitely worth checking out. You can also go there for advice and training.
You will also find nice educational worksheet that you can use in the classroom. Also take a look at their website and as a member you also get their publications.
The National Orchard Foundation
![National Orchard Foundation](https://bark.today/wp-content/uploads/2021/12/download-1.jpg)