Topic: Describe the concept of social capital. Which forms does it take? Analyze its impact on collective action.

Order Description
I am working on a project realted to informal practices. for example, people try to establish contacts and ask for favours in various situations, such as finding jobs for themselves or their relatives, avoiding queues in hospitals and even getting free healthcare, revolving around close doors to find solutions to the problems they face when dealing with bureaucratic matters.
I need a theoretical piece on social capital. Some scholars mention the importance of weak and strong ties. Some paragraphs on collective action would be very helpful.
But please do not include any examples as I have plenty of them.
(If the previous author gets the order, if he/she could keep intercessory wasta in mind while reading for and writing this essay, it would be helpful for him/her. But of course, no reference to wasta)