ک is one of the most-used letters in Urdu , it appears in everyday words like کتاب (book), کام (work), کھانا (food). The inner diagonal stroke (called the toay-mark or kaaf-mark) is essential. Children sometimes draw the body and forget the mark, especially in fast handwriting. Train the eye to check: body, then mark, then move on. ک paired with گ (one mark vs two) is the second canonical script-literacy pair after ف vs ق. Stroke timings approximate.

Writing کتاب where every stroke is in place, including the inner mark, is craftsmanship in miniature. Name the craft.