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+Note is a central entity in Trilium. Main attributes of note are title and content.
+
+Importantly, note itself doesn't carry information on its placement in note tree.
+
+Tree structure of notes can resemble file system - but compared to that notes in Trilium can act as both file and directory - meaning that note can both have its own content and have children. "Leaf note" is a note which doesn't have any children. 
+
+### Note types
+
+* text note - this is default note type which allows you to put rich text, images etc.
+* [[code note|Code notes]] - some kind of formal code, typically programming language (e.g. JavaScript) or data structure (e.g. XML)
+* [image note](https://github.com/zadam/trilium/wiki/Images) - represents single image
+* file note - represents uploaded file (e.g. docx MS Word document).
+* render HTML note - this works as an output screen of attached [[scripts]]
+* saved search note - contains saved search query and dynamically displays result of the search as its sub-notes
+* [[relation map]] note - visualizes notes and their relations
+
+Remember there's no "folder" note type. Any note can be folder or "leaf" note.
+
+### Root note
+There's one special note called "root note" which is root of the note tree. All other notes are placed below it in the structure.
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