I saw in some modules there are files that having extensions as .gsp , actualy can someone please tell me what are the .gsp files?
GSP stands for Groovy Server Page. Its a sort of templating engine(I’m not sure if this is the right terminology) similar to JSP. Putting it bluntly, its a HTML page with some embedded code which can communicate with Java. Here’s a page which can get you introduced to it: https://wiki.openmrs.org/display/docs/UI+Framework+Step+By+Step+Tutorial
thank you very much
hope you also find this helpul https://javabeat.net/introduction-to-groovy-server-pages-gsp/