I was reading the usage notes for _von_ on 
[this Wiktionary page](https://en.wiktionary.org/wiki/von#Usage_notes), 
where it talks about situations where using _von_ instead of the genitive is obligatory, optional, and colloquial.

For the most part, I understand that _von_ can be used in most cases colloquially,
and I understand the first case where _von_ is obligatory, 
but I am having trouble understanding the remark about personal and singular pronouns.
I had even more trouble understanding the section on circumstances where _von_ is optional,
i.e. both the use of the genitive and of _von_ are correct German.
I'm not sure what it means by "applicative genitive form." 
It seems like someone copied this chunk from somewhere 
because it refers to "lemmas" which are not present on the wiktionary page.

Could someone explain (better than the wiktionary usage notes) when "von" is obligatory, optional, and colloquial?

I saw 
https://german.stackexchange.com/questions/15141/replacing-the-genitive-with-a-von-construction?newreg=2e8646d73a2f4c7c8e2bf179e7c1ad09, 
but it doesn't really go into detail.