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This question is about certificate programs that pay well.
Web development is a good career to start at 30. Some companies will want their applicants to have a bachelor's degree, but many only require a high school diploma and the required technical skills. You can obtain most of these in a certificate program.
Web developers build websites from the source code up, and some even do the graphic and user experience design as well. Because the world is so reliant on the internet, there is plenty of work for web developers to create and maintain websites for companies.
While you can successfully start many careers at 30, often the best ones for this are the ones that require minimal time off of work for classwork and maximal time earning a regular salary. Some examples of careers like this include:
Real estate agent
Paramedic
Court reporter
While you shouldn't limit yourself to these options, they do have a minimal amount of time where you won't be getting paid a regular salary because they don't require on-the-job training.
This is often a major perk for people starting new careers in their 30s, as they typically have more financial responsibilities than those fresh outta high school do.
On the other hand, a career as a licensed practical nurse or as an electrician, plumber, or other skilled tradesperson can be fulfilling and lucrative, but they do require a larger investment of time upfront and clinical or apprenticeship hours that likely won't pay as well.

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