Building a big stack early involves a mix of patience, selective aggression, and capitalizing on weaker players. Start by playing premium hands aggressively to extract maximum value when you have a strong edge. Target inexperienced players who overvalue hands, and look for opportunities to play speculative hands, like suited connectors, when the risk is low. Position is critical, allowing you to play more hands profitably when you can control the action. When you hit strong hands, focus on maximizing value by extracting chips, rather than bluffing excessively. Your goal is to steadily accumulate chips by making high-percentage plays and avoiding unnecessary risks.