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Schema markup helps describe the content on a page in a machine-readable form. It is useful when accurate and appropriate, but it is not a button that guarantees better rankings or a special search display. The visible content still needs to support what the markup says.
Describe the page that actually exists
An article can identify its headline, author and dates. A business description can identify the organisation. Breadcrumb markup can reflect the page's place in the site. Choose the relevant type instead of adding every available field.
Do not invent reviews, ratings, awards or credentials to populate markup. If a project is a prototype, do not describe it as a widely used live product. Accuracy matters as much as valid JSON syntax.
Separate validity from search eligibility
A validator can confirm that code is parseable and identify some missing fields. It cannot establish that every claim is truthful or that a search engine will choose a rich result. Google's structured data guidelines explicitly say display is not guaranteed.
Also check that the page is public and that the markup is available in the served response. A technically valid block on an excluded page cannot replace basic accessibility and indexing checks.
Keep responsibilities clear
A theme and an SEO plugin may both generate structured data. Review their combined output to avoid contradictory authors, URLs or dates. Update the relevant source when visible information changes.
My site uses structured data alongside canonical links, page content and sitemaps. Explore SEO support, my portfolio or discuss your site's setup. Read Do I need an SEO plugin for my WordPress website? for tool responsibilities and Why is my new website not showing on Google yet? for indexing basics.
Use markup to make an already useful page easier to interpret. Judge the implementation by accuracy and consistency first, then monitor how the search engine actually represents the page.