There are a lot of ongoing initiatives - perhaps too many! - related to developing capacity for utilizing EO data and geospatial tools for agricultural assessment. Most, however, are focused on ultimately developing larger scale mapping products or statistics. We could do more to work with extension. Anyhow, here are some resources:
G20 GEOGLAM Capacity Development Team - our web presence is poor, but reach out to me, akwhitcraft AT geoglam DOT org if you're interested in EO specifically for agricultural assessment at subnational to global scales for productivity and land use monitoring
Committee on Earth Observation Satellites Training Calendar - https://training.ceos.org/ - repository of upcoming trainings
G20 GODAN Capacity Development - https://www.godan.info/working-groups/capacity-development-working-group - rich mailing list with lots of resources related to more than EO... all kinds of info about data licensing, legality, etc.
NASA ARSET - https://arset.gsfc.nasa.gov/ - lots of trainings on many topics
ESA EO College - https://eo-college.org/