What belongs in your text
Add two to four short points for each job. Explain your work, not only your title. For skilled trades worker, this matters when you perform practical work on site. Write what you did, where it happened and why the work was useful.
A good example is a short account of how you check materials and maintain tools. It shows real work rather than an empty claim. If you have not done that task, choose a different example from your own work.