Color mixing in Adobe Photoshop is a straightforward process. Start by selecting the color you want to use with the Color Picker tool. Then, choose the Brush tool to apply the color to your image. Adjust the brush size, hardness, and opacity as needed. Experiment with different blend modes to achieve the desired effect. You can also adjust the layer opacity and use layer masks for more precise control over the color mixing. Additionally, try using adjustment layers and the Gradient tool for more advanced color manipulation. With these tools and techniques, you can easily mix and blend colors to enhance your images in Adobe Photoshop.