AdvancedAPI provides for example, ItemBuilder, AdvancedInventory, AdvancedCommand which can be used to create things faster.
The issues section is an issue tracker for all the kinds of problems covered in issue templates. When opening an issue, provide as much information as possible. The difference between a bug getting fixed in 1 week versus 1 hour is in quality of the report. Bug reports where steps to reproduce are. "IDK" have no value and will not help to get the bug fixed at all.