When you are creating your resume, you don’t need to put every random job you’ve ever had. What companies do is they look at your jobs on the resume, and at most call the employer and ask them if you worked for them and how you did at the job.
There is no way for a non government employee to know if you worked other jobs. Keep off any jobs that you worked at for less than 2 years and use every skill you learned as a skill for your resume.
Nothing hurts your resume more than having 3 or 4 jobs in a span of 2 years because it shows you are unreliable.
Good advice, but it depends. Some people don’t want to show a gap in their resume, for any reason. It all depends on the story you want to tell. If you think the experience is directly relevant to the story you are looking to tell, put it in.
Did you do some temp work in your field for few months between full-time gigs? Probably best to include that, especially if you learned or applied relevant skills. Did you end up working in a different field to make ends meet instead? Probably best to leave that out, unless you can relate that unrelated experience to what you want to do now.