Firstly know what they are!
When to use them.
What type of language do we use in them?
(formal/informal) [Direct/indirect]
Change it for each job you apply for
Ask a friend to proof-read it to make sure it makes sense
Use key words from the job advertisement e.g. computer literacy, team player, initiative
Job title and location
skills
Identify requirements
Experience needed
*Know the difference between what is a job skill and what is a requirement of the job.
Technical Sales Executive