Hi Danielo,
The basic idea is this:
1. Three left tabs: a tab for a table of contents, a second tab with extra editing stuff (I don't use this tab much, but the tagnotiddler+missing list and the orphan list do actually help me fill out what is missing in the hierarchy), and a tab with the stuff from the rightsidebar.
Open the @ on the table of contents tab ($:/_Tronco) and edit it to create links from there and work your way down.
2. Viewtoolbar in each tiddler:
a. Clicking the up arrow reveals the parent tiddlers - basically, tiddlers with titles that correspond to the tags of the present tiddler. Create parents by tagging then creating tiddlers for the tag.
b. Clicking the down arrow reveals the child tiddlers or subcategories - tiddlers tagged with the title of hte present tiddler. These are created by any of the new here buttons to the right of the arrows (see below)
c. Clicking the right arrow reveals the related tiddlers - tiddlers linked to from the present tiddler and tiddlers that backlink to the present tiddler.
d. The square icon is to create a new tiddler tagged with this tiddler's title. (in TW classic terminology, "new tiddler from here")
e. Next is the new index from here - a new tiddler tagged with this tiddler's title, but also with a list of all tiddlers tagged with that index's title.
f. New image tiddler from here
g. New image gallery from here - every tiddler tagged with the gallery's title will appear in the gallery in miniature
h. New checklist tiddler from here
i. New contact tiddler from here
j. New contact list from here
3. Another modification is the hamburger to open and close the leftmenu and thus widen or narrow the tiddler width
4. In edittemplate the tag adding field is wider and in a format so that the user can see many more tags on the screen.
This is not an adaptation for TW5 that I am promoting that others use. Though certainly if you like anything from it, feel free to use it. I am just showing you this as a template I am using for my notes. How do I use it?
1. I have started a contact TW. I add the main categories to $:/_Tronco, then quickly add subcategories of contact lists, then contacts, by using the new contact list from here and new contact from here buttons.
2. I have notes TWs by topic where I do the same but with notes and indexes.
3. I will no doubt eventually have a TW with image galleries.
The idea of these tiddlers is this: create a topic tiddler. With one click create a subtopic tiddler. With another click a grandchild tiddler, etc etc. Move up and down the hierarchy with the lists in the up and down arrows. And quickly add different kinds of tiddlers - images, indexes, galleries, contacts, etc.