The most common types of lumber used in construction include softwood (such as pine, spruce, and fir) and hardwood (such as oak, maple, and cherry).

Lumber is graded based on its quality and intended use. The highest grade is typically used for finished carpentry, while lower grades may be used for framing or other purposes.

When selecting lumber, consider the intended use, the appearance you want to achieve, and the budget. Look for straight, clear pieces with minimal knots, and avoid boards with cracks, splits, or warping.