You cannot negotiate if you do not have the tools to do so. Being able to attest to deserving the salary that you are requesting starts in the very beginning of your job search. Employers are conscious of their budget and how much they are willing to invest in a position or and employee. In most cases funds are allocated for future roles in advance to hiring new candidates. Keep that in mind, if you are applying for roles that require no training, you may have more bargaining room than in a job that requires a degree, certificates, or training.
Here is what I mean. Many jobs consider the years of experience that one has acquired over the course of their work history. Important, employment factors such as the knowledge skills and abilities required to perform certain tasks are discovered when sharing your background and work history. Learning how to point to specific skills if necessary is a good way to prepare should you need to reference your strengths and capabilities. Employers will surely notice your qualifications upon receiving your resume however, that may not stop them from asking what you expect in terms of your pay rate.
What if you're asked to provide your salary requirements? The best way to respond on an application is to use the term "negotiable." If communicating in person, feel free to give a broader answer such as "My salary expectations align with my experience and qualifications." The value of your abilities are great incentives to employers looking to hire quality candidates. By being reasonable you show flexibility and leave room for negotiation. It may even demonstrate why you're not only the perfect candidate but worth the extra penny.