I am relatively new to the world of SEO and have been given responsibility to improve SEO rankings for our company website (which is full of jobs). We are London based digital media recruiters and work in a number of niche industries. Should job titles be the keywords I try and optimise, as opposed to keywords such as 'digital media recruitment london', 'London digital marketing jobs', 'digital media recruiters in london' etc?

Today I have signed up for a month's trial on Moz Pro so am hoping this will provide me with a lot of help as I start creating an SEO strategy,

Any help or advice would be greatly appreciated.