Memorize Gurbani from both Granths

ਦੁਹੂੰ ਗ੍ਰੰਥ ਮੈ ਬਾਨੀ ਜੋਈ । ਚੁਨ ਚੁਨ ਕੰਠ ਕਰੇ ਨਿਤ ਸੋਈ ।

The Gurbani within both [Adi & Dasam Guru] Granths, select various portions and memorize those daily.

Bhai Desa Singh Rehatnama (Mid 1700s)