bigtree/
bigtree/install.php
visit this page to intstall BigTree, after it's installed, you'll want to promptly delete the file
bigtree/license.txt
BigTree's license Lesser GPL
bigtree/bigtree.sql
bigtree/example-site.sql
the database for the bigtree's example site
bigtree/example-site/
a BigTree site that highlights a handful of bigtree's features, browse around to get familiar
bigtree/core/
Contains core BigTree CMS, shouldn't be edited as this directory is replaced in CMS upgrades
bigtree/templates/
bigtree/templates/basic/
Contains your page template files
bigtree/templates/routed/
for more info on how routed templates work, see https://www.bigtreecms.org/docs/dev-guide/templates/,
bigtree/templates/callouts/
though this appears to be lacking detailed info on how routing occurs as well. I'll note that for future changes. /templates/callouts/ contains your Callout templates.
bigtree/templates/layouts/
/templates/layouts/ contains your layout files, which are described on this page.
bigtree/site/
This is your public root, basically what is exposed to your users.
Generally whatever you drop into this directory is accessible directly and is
used for CSS, JS, images, etc. You can also drop things like WordPress into here
if, for instance, you wanted /blog/ to be a WordPress blog.
bigtree/cache/
This contains basic cache information and is used for temporary storage
bigtree/extensions/
This is where installed (and built) extensions are housed.