What are (were) the most difficult parts of D?

[zjh]

On Saturday, 14 May 2022 at 12:46:45 UTC, frame wrote:
  Every
> larger app with a news feed also has possibility to 
> categorize/filter it.

I think we can set up a special `web page` to collect `good 
posts` and classify them according to `'author/category/label'`, 
and its content can be extracted directly from the forum.
  `Web pages` are just used to `organize` them.

It can also be placed `offline` in the document. This is very 
good if there is enough content ,It will greatly reduce the 
`threshold` of D . Avoid others saying that no one can understand 
`d`.