the template is joomla-bootstrap4,
Recaptured from Github
JLTRY/joomla-bootstrap4-template: Joomla! 4 Site template for Bootstrap 5

Adding positions to the template

I added to the template the positions heading 4, heading 5, heading 6,

templateDetails.xml

...
position-4
position-5
position-6
...

The aim was to add under Articles 3 headings:

Changes

Switch to bootstrap 5 version

Addition of 3 positions