The phrase "to spread the knowledge" means to share information with others so that they can learn and understand something new. It is about making sure that more people have access to knowledge and can benefit from it. Full definition
The conference will give insight into some controversial topics, help spread knowledge of cryptocurrencies, and provide attendees with valuable information regardless of experience level. (bitcoinmagazine.com)
-- A range of initiatives focused on spreading knowledge about graphene to the wider world. (sciencedaily.com)
Human rights reporting was also seen to be consciousness - raising by spreading knowledge of rights. (blog.politics.ox.ac.uk)