The Geonet Help section is typically used for asking questions related to the forum itself, like 'How do I post pictures' etc. You may want to re-post this in a more appropriate space, such as the GIS section.
As far as your request for data, you may want to narrow down your actual area of interest. For example, do you want data for the entire planet or just one county in the USA?
Here are the watersheds: https://nhd.usgs.gov/wbd.html
This is a link to topographic map files: https://store.usgs.gov/b2c_usgs/b2c/start/(xcm=r3standardpitrex_prd)/.do Although it is also a store, downloading the GIS data is free.