1. Type of Ingredients
Know (it's all explained as you follow the example simple wok recipes) your ingredients. Know which wok ingredients in the recipe cook fast, and which ones take a while to cook in the wok. For example, bell peppers, portabella mushrooms, carrots and cauliflower all cook pretty slowly. Onions, snow peas, prawns - all cook fast.
2. Preparation of Ingredients
When learning how to cook with a wok, most importantly, use common sense (and experience) to know how to prepare your ingredients for the one-pot wok cooking recipes. If you take a slow cooking vegetable like broccoli and cut it into tiny, tiny pieces - it won't slow cook. It will cook fast because the pieces are tiny. If you have a jumbo prawn that is 5 oz, it will need longer cooking than a 1 oz jumbo prawn. Follow the examples of the recipes to get a starting point for sizes of vegetables and other ingredients.