Does making changes to the content of a web page, such as adding content, adding H2H3 headings, and adding image ALTs, affect the keyword rankings already achieved?

Yes, if you can do all the technical SEO with your website, it's you'll definitely get better results with your website.

1. On-Page Changes and Rankings

Content Updates (adding paragraphs, FAQs, clarifications, etc.) usually help, not hurt. Google likes fresh, comprehensive content as long as it stays relevant to the target keyword and search intent.

Headings (H2/H3) give structure. If you insert them naturally and include related keywords or semantic variations, they improve readability and SEO. They won’t drop your rankings unless you remove or weaken existing keyword placements.

Image ALT Tags are low-

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Yes, making changes like adding content, H2/H3 headings, and image ALTs can influence keyword rankings—usually positively—by improving relevance, structure, and accessibility, though sudden major edits may cause temporary ranking fluctuations.

Yes, any changes in the contents of an webpage may affect ranking either positively or negatively. Normally regularly updated pages are given priority by the Search Engines.