I'll second what Kat said. Read her advice over and over till it makes sense and sticks.
Chapters are more of an aid to writers to help them organize their work. Readers don't notice them much if at all - if you've sucked them in and locked them into your story. A chapter ending is then just a page turn. Or maybe a good place to put down the book so they can run to the bathroom to relieve an overfull bladder.
I think in terms of scenes: a narration of events with enough sensory detail to make the reader feel they are experiencing the story along with the main characters(s). They have a definite beginning and ending in time and space, though the scale may be milliseconds or millennia, and millimeters or light years.
Scenes often have a setup, development, and resolution, though they may be pretty minimal. Especially the shorter scenes. I may put several short scenes into a chapter. Or divide a very long scene over several chapters. When I do that I usually end a chapter with a bend or curve in the scene, as when a secondary character enters or leaves it, or the action changes intensity.
_____________________________I'm now on my eighth book, with three completed and online available as both ebooks and "pbooks" via the CreateSpace print-on-demand service, three others completed but in different rewrite stages, and my very first forever on the shelf. I'm finding both my quantity and quality are increasing with every book.
This one is going very fast because I've learned how to combine scenes with scene summaries so that I have an intuitive grasp of the whole complete work without needing a detailed outline. Once the book is done I then go back and expand scene summaries if they warrant expansion. And often to trim scenes in which I put too much detail. (Too much for the reader. The detail was useful to me to make sure I got the events right, but much of it can be discarded once I have the overall scene well visualized.)