Hi, welcome, you’ve got it right so far.
The web application that the server provides is called ‘Databrowser’ which the green [ + ] and toolset. In a folder that has no index.html then that’s what you’ll see. If there’s a index.html then it runs as an app.
So, for example if you drop an index.html onto the [ + ] of ‘public’ root folder you’ll lose access to the toolset and [ + ], so then you have to go to thru; profile -> card -> storage -> toolset.
If you install the server on localhost then i recommend to keep the default port (8443) cos it still uses the default port for login popup authentication (bug).
When you set up your own server (localhost or domain) you will need “multi-user” wildcard ssl (https) certificates cos the user accounts are all sub-domains.
If you have an online pod with working app folder and just copy that to a folder to localhost pod it won’t load cos each file in the folder needs a [filename].[ext].acl (Access Control List permissions) and a .acl for each folder. On top of this there are .ttl files (turtle triples lists) which describe the files in each folder, etc. (you can find these on the toolset to the left of the rainbow icon) The Databrowser doesn’t show these files from a folder listing (hidden), but when you upload files with the [ + ] or create folders, then the .acl and .ttl files are created automatically. (hence they are missing if you just copy an app via local filesystem)
A good way to get started learning is to install Jeff’s Solid IDE which will let you edit files more easily. (but remember the index.html replaces your toolset on public folder)
(i’ve made all the above mistakes myself, so getting a local pod running has been a learning experience) Hope it helps.