Please check below article for your use case:https://aem4beginner.blogspot.com/property-merge-post-processor-in-aem 

Please refer below articles:https://experienceleague.adobe.com/docs/experience-manager-cloud-service/assets/admin/graphql-api-content-fragments.html?lang=en#adminhttps://experienceleague.adobe.com/docs/experience-manager-learn/getting-started-with-aem-headless/graphql/explore-graphql-api.html?lang=e...

Please refer below article:https://stackoverflow.com/questions/51248715/build-failure-version-increase-required-failed-to-execute-goal-org-apache-felihttps://github.com/bndtools/bnd/tree/master/maven/bnd-baseline-maven-plugin#fail-on-missing-baseline 

@JAWillis : Can you please refer below articles and check if you followed all steps while creating Template for your project.http://www.sgaemsolutions.com/2017/09/dynamic-editable-templates-in-aem-63.htmlhttp://www.sgaemsolutions.com/2017/09/dynamic-editable-templates-in-aem63.html 

@Umesh_Thakur Can you please check below article and try checking mentioned root cause to fix your issue if that helps.https://stackoverflow.com/questions/38878394/javax-jcr-invaliditemstateexception-item-cannot-be-savedhttps://helpx.adobe.com/in/experience-manager/kb/how-to-find-conflicts-when-gett...

Please check below articles:https://exadel.com/news/aem-tip-junit-aemcontext-integration-with-an-aem-repository/https://aem4beginner.blogspot.com/aem-mocks 

Usually this error comes if your code has dependency on Underscore.js/LoDash.js . Can you please try validating if its added and loading properly. https://stackoverflow.com/questions/13556010/referenceerror-is-not-defined

Glad to hear that. Thanks !

Please check below article:https://medium.com/@theopendle/aem-view-all-editor-overlays-with-a-wireframe-mode-97028f540fa 

Check second URL : https://adobe-consulting-services.github.io/acs-aem-commons/features/named-image-transform/index.html