This is the 3309th most frequent Spanish word.
colocar
To place, put, or position something.
Here, 'coloca' is used in the imperative form to instruct someone to place or position items in a specific location.
Por favor, coloca los libros en la estantería.
Please, place the books on the shelf.
In this sentence, 'colocando' is the present participle describing the action of arranging or putting into place when building.
El trabajador está colocando ladrillos para construir el muro.
The worker is laying bricks to build the wall.
The usage of 'colocar' in this case implies organizing or setting items into their designated positions to achieve a goal.