If you ask any Russian philologist, they will tell you that Ders 8 is notorious because it introduces . English uses one verb for "to go" (walk, drive, fly). Russian uses at least 14 pairs. But don't panic. Ders 8 focuses on unidirectional vs. multidirectional .
Я обычно хожу на автобусе, но сегодня иду пешком. (Ya obıçno hoju na avtobuse, no sevodnya idu peşkom. – Genelde otobüsle giderim, ama bugün yürüyerek gidiyorum.) Rus Enstitusu - Ders 8