I did all the quests but I can't get this knowledge???

Don't have knowledge on: Grusha's Whereabouts
Finished quest: Embarking on an Adventure
Finished quest: Gobs and Gobs of Help -[Crossroad]
Finished quest: Save 'Em for a Rainy Day -[Crossroad]

Have to choose Grusha's 'Lets talk about this' crossroad option when you first meet Grusha.
When you get to Finto Farm crossroads choice, choose the 'Black Stones Have a Time and Place' option
Continue thru story line until it brings u to heidel pass to talk with Kirkley

Para conseguir esse conhecimento, você precisa escolher esses caminhos durante as quests de Balenos:

[Escolha] Posso resolver suficiente com palavras
[Escolha] A pedra negra precisa ser utilizada em algo realmente necessário

The latest renewed questline has crossroads 'Lets talk about this' and 'Black Stones Have a Time and Place' options.

Older questline has 'Gobs and Gobs of Help -[Crossroad]' 'Save 'Em for a Rainy Day -[Crossroad]' options.

And the oldest questline doesn't have any correct quests which grant you the option to get the knowledge.

знание Местонахождение Абеляра
Выполнено задание Баленоc Подготовка к путешествию
Выполнено задание Баленос Выбор Кулаками делу не поможешь
Выполнено задание Баленос Выбор Применение черного камня