Day notes
A common pattern in note taking is that a lot of notes will be centered around certain date - e.g. you have some tasks which needs to be done on certain date, you have meeting minutes from certain date, you have your thoughts etc. and it all revolves around a date on which they occurred. For this reason it makes sense to create certain "day workspace" which will centralize all those notes relevant for certain date.
For this, Trilium provides a concept of "day note". Trilium semi-automatically generates a single note for each day. Under this note you can save all those relevant notes.
This pattern works well also because of cloning functionality - note can appear in multiple places in the note tree so besides appearing under day note, it can also be categorized into other notes.
You can see structure of day notes appearing under "Journal" note - there's a note for the whole year 2017, under it you have "12 - December" which then contains "18 - Monday". This is our "day note" which contains some text in its content and also has some child notes (some of them are from Task manager).
You can also notice how this day note has promoted attribute "weight" where you can track your daily weight. This data is then used in Weight tracker.
Trilium has some special support for day notes in the form of backend Script API - see e.g. getDateNote() function.
Day (and year, month) notes are created with a label - e.g. @dateNote=2018-08-16 this can then be used by other scripts to add new notes to day note etc.
Journal has attributes @sorted @child:sorted @child:sorted:sorted (see attribute inheritance) which keeps notes sorted on all three levels of years, months and dates.
Journal also has relation "child:child:child:template=Day template" which effectively adds template to day notes (grand-grand-grand children of Journal). The template is pretty simple - it just adds "weight" promoted attribute to keep track of our daily weight.