Right after writing my own note-taking application I discovered Obsidian, had a look at the details, and archived my GitHub repo to switch to this wonderful product 
After some time trying the basic features, I would like to go deeper in the templating - I am looking for “bootstrap advice” (some pointer to the right direction to get me started).
Specifically, I would like to build table of content pages where I would link to pages having specific tags (and other conditions), something along the lines of this pseudo-code:
for page in obsidian.allPages:
if "hello" is in page.tags:
{{ <li>{page.title|page.filename}</li> }}
(= create bullet points called after the title of the pages containing the tag hello and link them to the filename of the page)
I would like this to be a dynamic page - so that when I open it the content is updated with the current relevant pages in the vault.
What is the general direction I should take for that? (coding is OK, maybe even better than some complex non-code solutions - but anything will be wondeful anyway)