Laying bricks in a straight line requires careful planning, precise measurement, and proper technique. Here's how to lay bricks in a straight line:

1. **Prepare the foundation**: Ensure that the foundation or base surface is level, stable, and properly prepared to support the weight of the bricks. Clean the surface and apply a layer of mortar or adhesive to provide a solid bonding surface for the bricks.

2. **Mark the layout**: Use a chalk line or string line to mark a straight line on the foundation surface where the first row of bricks will be laid. This line serves as a guide for aligning the bricks and maintaining straightness throughout the bricklaying process.

3. **Mix mortar**: Prepare mortar according to the manufacturer's instructions, ensuring the correct ratio of ingredients and consistency for bricklaying. The mortar should be workable but not overly wet or dry.

4. **Apply mortar**: Use a trowel to apply a bed of mortar along the marked line on the foundation surface. Spread the mortar evenly to the desired thickness, following the layout marks as a guide.

5. **Set the first brick**: Place the first brick firmly into the mortar bed, aligning it with the layout marks and pressing it down gently to ensure good adhesion. Use a level to check for both horizontal and vertical alignment.

6. **Continue laying bricks**: Lay subsequent bricks along the marked line, pressing them firmly into the mortar bed and maintaining consistent spacing between bricks. Use a level and straight edge to ensure that each brick is aligned with the previous one and that the entire row remains straight.

7. **Check alignment regularly**: Periodically check the alignment of the brick row using a level and string line. Adjust the position of bricks as needed to maintain straightness and ensure that the row remains aligned with the layout marks.

8. **Tool the joints**: Once the row of bricks is laid, use a pointing trowel or jointing tool to shape and finish the mortar joints between bricks. Create a uniform profile and smooth finish, taking care to maintain straight lines and consistent joint thickness.

9. **Repeat for additional rows**: Continue laying bricks in straight rows above the first row, following the same process of marking, laying, and aligning each row with the previous one. Use spacers or guides to maintain consistent spacing between rows and ensure uniformity in the finished brickwork.

By following these steps and taking care to measure, align, and adjust as needed, you can lay bricks in a straight line and create professional-looking brickwork for your project.