white hashed area is not a physical separation and therefore in general does not cause roads to be mapped as physically separated (though in some extreme cases it may be necessary for sanity, and there may be also physical separation within hashed areas)

and welcome to OSM! We definitely need a lot of help with many things!

If in doubt (also if someone claims something and you are unsure is this accurate), feel free to ask at https://community.openstreetmap.org/ or other places seen on sidebar when saving edit in browser