Maintaining proper alignment when building a brick wall is essential for structural integrity and a professional finish. Here's how to do it:

1. **Use a level**: Continuously check the level of each course of bricks horizontally and vertically. Adjust as necessary to ensure the wall remains straight and plumb.

2. **Use string lines**: Install string lines at the beginning of the wall and periodically throughout the construction process to guide the alignment of the bricks. These lines act as a reference for keeping the bricks straight and level.

3. **Work in small sections**: Focus on building one small section of the wall at a time, typically no more than a few feet long. This allows you to concentrate on maintaining alignment in manageable increments.

4. **Use spacers**: Place spacers between bricks to ensure consistent spacing and alignment. These can be commercially available plastic spacers or simply small pieces of wood or plastic.

5. **Tap bricks into place**: Use a rubber mallet or the handle of your trowel to gently tap bricks into position, adjusting their alignment as needed.

6. **Check alignment visually**: Step back periodically to visually inspect the wall for any misalignments. Making adjustments early on can prevent major alignment issues later in the construction process.

7. **Regularly clean excess mortar**: Clean excess mortar from the joints as you work to ensure a tight fit between bricks and maintain proper alignment.

By following these techniques and paying close attention to detail throughout the construction process, you can maintain proper alignment when building a brick wall.