Ever wondered what type of opening the best players are using? Have you got yourself familiar with ECO codes i.e, Queens Indian, Sicilian-Najdorf, Caro -Cann, King's Gambit etc... Why don't you use the ''Opening Classification'' and learn the theoery of moves by sequence.
A) In Chess Base environment open OM database and Go to Tool -> Opening Classification
B) Follow the Opening Classification screen below and learn details. You can expand and collapse sections there as well.