This lesson is about horizontal support and resistance levels in technical analysis. The lesson covers the different types of levels and the three key principles when it comes to support and resistance. The lesson also discusses what makes a strong level and provides a drawing tip for more precise entries and exits. Trading the inverse is explained, and the two different types of retests, micro and rounded, are covered. The lesson concludes with a note on timeframes and the importance of basing levels on recent price action. The lesson emphasizes the importance of understanding support and resistance as it is a key concept in trading.