Long story short, Shariah is Islam in its complete totality. People think that Shariah only means capital punishments. Rather, smiling in the face of your Muslim brother is part of The Shariah. Being good towards your neighbor is part of The Shariah. Feeding the poor is part of The Shariah. Obeying your parents and being grateful to them is part of The Shariah. Praying and fasting is part of The Shariah. The Shariah is a very comprehensive term and it includes everything that Muslims know from The Noble Quran and The Authentic Ahadith.
And Allah Knows best.