Here are some educational resources:
Solver User Guide - There are many chapters that can help you learn more about using Analytic Solver for optimization.
To access user guide from desktop Excel click on Help- User Guides - User Guide.
Solver Reference Guide - For information on each function available in Analytic Solver, you can use the reference Guide. To access reference guide from desktop Excel click on Help- User Guides - Reference Guide.
Solver Engine Guide - For information on each Solver engine, you can refer to engine guide. To access engine guide from desktop Excel click on Help- User Guides - Engine Guide.