<human>:  What are the best techniques and tips for painting a wall?
<bot>: The best techniques and tips for painting a wall include: 
1. Cleaning the wall surface prior to painting to remove dust, grease and other debris; 
2. Applying an even coat of primer to the wall before starting to paint; 
3. Choosing high-quality paint and using a brush, roller, or sprayer to apply the paint; 
4. Making sure to overlap each paint stroke to avoid “lap marks”; 
5. Check the drying time of the paint used to avoid smudging or disturbing the paint finish.