Beginners in Texas Hold'em often play too many hands, leading to trouble with weak holdings. They may also overvalue marginal hands and struggle to fold when facing aggression, costing them chips. A lack of understanding about position and its importance can lead to suboptimal decision-making. Many beginners neglect proper bet sizing, either betting too little to protect their hands or too much, risking their stack unnecessarily. Additionally, they often chase draws without proper odds and may struggle to adapt to different opponents' play styles, leading to predictable and exploitable behavior.