For those who successfully TTC

When are the best days to have sex? Is it wrong to do it every single day during the fertile week? I’ve read some posts where people recommended only the 2 days before ovulation to save up the strong sperm. My cycles also range anywhere from 26-28 days so I’m thinking of getting ovulation strips as well to know. But even then am i supposed to have sex BEFORE ovulating or what did you ladies do that worked?