Following 2 things required me to look for help in #zabbix, I guess it would be nicer if API docs cover these two things in the docs itself.

When user tries to create a template item it wasn't very clear how to assign an item to a template. The trick is to set hostid of the item to templateid of the template you want to assign it to. I was looking for templateid property in host object and got confused. This info on item.create page would be really helpful

When user tries to create trigger dependency it wasn't very clear that you can only add dependencies on the host level. I tried to create a dependency between template triggers which didn't work out. The trick here is to create triggers on template level then add dependencies on the host level. This info possibly on trigger.adddependencies page would be very helpful.