Why does it say "u'Shmartem
Rashi: "U'Shmartem" refers to learning the issues, and "va'Asisem", to practicing them when the need arises. 1
Moshav Zekenim #1 (from Bava Metzi'a 17a): Learning has precedence over fulfilling Mitzvos. However, fulfilling Mitzvos has precedence over teaching others. 2
Moshav Zekenim #2: Anyone who is not learned cannot do [such] proper deeds. A Bur (crude person) cannot fear sin, and an ignoramus cannot be a Chasid (Avos 2:6).