The idiomatic expression "to learn from one's expertise" means to acquire knowledge or skills through personal experience, observation and practice. Full definition
To work in an environment which will me to share my expertise with others and to learn from the expertise of others. (members.climber.com)
Learn from the expertise shared by others and discover the advantages of highlighting your own expertise and expanding your professional network. (aneliteresume.com)
The prime minister said he has told senior ministers to learn from the expertise of the other party. (channel4.com)