@Elizabeth can you please share more details on which exact components authored? Sounds like you added RTE, placed an image inside RTE and expecting image inside RTE to be responsive. This is NOT ootb.
You can read similar issue discussed here. https://stackoverflow.com/questions/42629863/aem-page-with-rich-text-and-image
Basically split your content into 2 components: RTE + Image component below. That will be responsive.
Most components are responsive unless you try some variations. Should split content accordingly. Or pick correct component for usecase. Refer to component library here https://www.aemcomponents.dev/
Last option, should consider creating custom components to cater requirement.