Test how good the teacher you follow really is, feel free to ask him where you can short and where you can go long today. Some teachers, guess what? For example, taking Erbing as an example, you can go long at 4600-4630, 4500-4530, 4400-4450, and 4200-4250. Why the hell don’t you say you can go long at 4600-4200? Isn't that more convenient?