Hey there Android users i have a question that i would like to ask,so the question is,does putting apps and widgets on the homescreen uses/takes up RAM?
App shortcuts, no. Widgets probably use a little bit of RAM, though. They can also contribute to battery usage, if they cause the phone to check the web frequently for updates (like a weather widget).
You can't place an app on the homescreen. You can open an app, such that it is functioning in the foreground (in which case the homescreen launcher gets cached in the background). Or, if the app has a widget, you can place the widget on the homescreen, which will perform some fairly basic function, and use a small amount of RAM. But there's no way of placing a fully active app within the homescreen.