What outputs are you expecting. See below documentation for number formatting in aem using sightly. https://github.com/adobe/htl-spec/blob/master/SPECIFICATION.md#1223-numbers

In other components html you can use pageproperties.fieldName to get the value authored on page. Something similar to ${pageProperties.jcr:title}

You can’t directly pass a value from one component to another unless otherwise you are storing the value on page properties instead of components or uses cookie or local storage (not recommended)

Via package manager. You can place those images in your code base and deploy it on aem via package manager or maven build.

For local setup you need to run local universal editor as well. Details are on https://experienceleague.adobe.com/en/docs/experience-manager-cloud-service/content/implementing/developing/universal-editor/local-dev

Yes if you remove the package from install folder it will remove it from the installation.

It seems acs-commons version 4.0.0 is not compatible with aem Uber jar 6.5.12 you are using. Try updating the acs-commons version as well

You need to move you business logic from jap to service but if you still want to do in jsp then you need to whitelist all bundles and may be you require a code refracting as well. Please see below docs to whitelist all bundles https://experienceleaguecommunities.adobe.com/t5/adobe-experience-manager...

It should map to your core bundle symbolic name. <bundleId>:<subServiceName>=<systemUser> please also look for below notes on https://experienceleague.adobe.com/en/docs/experience-manager-65/content/security/security-service-users   Administrative sessions in JSPs JSPs cannot use loginService(), be...

Is it on your local setup or you are facing this challenge on AEMCaS environment. If you are facing this issue on your local the. I would recommend restarting your aem instance to see the change currently coming from repoinit script