Starting Hand Selection: Stick to premium hands (high pairs, suited connectors, face cards). Avoid playing weak hands.
Position: Play more hands in late position, where you can observe opponents' actions and make better-informed decisions.
Bet Sizing: Use consistent bet sizing to avoid revealing hand strength. Don't overbet or underbet the pot.
Pot Odds: Learn to calculate pot odds, comparing the potential winnings to the cost of a call. Use this to decide whether to continue in a hand.
Tight and Aggressive Play: Be selective with your starting hands (tight) and assertive when you enter a pot (aggressive). This helps build a solid, consistent game.
Bankroll Management: Set a budget for poker, and stick to it. This protects you from significant losses.
Avoid Fancy Play Syndrome: Don't overcomplicate your game with advanced moves. Stick to straightforward play as you develop your skills.

Once you have a solid foundation, focus on refining your skills and developing a deeper understanding of the game. Key intermediate strategies include:

Range Analysis: Start thinking about opponents' hand ranges instead of specific hands. Consider the entire spectrum of hands they could be holding.
Exploiting Opponent Tendencies: Identify patterns in opponents' play and exploit their weaknesses. For example, if they fold too often to bluffs, apply pressure with well-timed bluffs.
Continuation Betting: As the pre-flop aggressor, continue the aggression post-flop to maintain control, potentially winning the pot if opponents fold.
Semi-Bluffing: Bet or raise with drawing hands, such as flush or straight draws, to apply pressure while retaining the potential to improve your hand.
Table Image: Be aware of your table image (tight, loose, aggressive, or passive) and adjust your strategy accordingly.
Balancing Your Range: Mix up your play to avoid becoming too predictable. Include some bluffs and weaker hands in your range, while still playing predominantly strong hands.
Advanced Pot Odds: Learn implied odds and reverse implied odds, which consider potential future bets in addition to the current pot size.
Bet Sizing Tells: Identify opponents' bet sizing patterns to gain information about their hand strength.

Advanced players focus on deep game theory, player psychology, and nuanced exploitative play. Key advanced strategies include:

Game Theory Optimal (GTO) Play: Study game theory to develop a balanced, unexploitable strategy that works against skilled opponents.
Hand Reading: Develop your hand reading skills to accurately narrow down opponents' ranges and make precise decisions.
Meta-Game: Understand the psychological aspects of poker, such as leveling wars and inducing mistakes, to gain an edge over opponents.
Bluff Catching: Identify spots to call with medium-strength hands, catching opponents' bluffs.
Polarized Ranges: Develop a polarized betting range, consisting of strong hands and bluffs, making it difficult for opponents to exploit you.
Blockers: Consider the impact of blockers (cards in your hand that reduce the likelihood of opponents holding specific hands) on your decisions.
3-Betting and 4-Betting: Master the art of 3-betting (re-raising) and 4-betting (re-raising a 3-bet) to apply pressure and exploit aggressive opponents.
Multi-Street Planning: Plan your actions several streets ahead, considering potential future board runouts and opponent actions.
Advanced Bankroll Management: Learn to manage your bankroll according to risk tolerance, game type, and win rate, maximizing long-term success.