How an individual , company or Govt institute track us??Without my Laptop is bugged.(using linux mint)

Question

1. My question is can our YouTube activity tracked precisely e.g they can know what video quality i am using.
2. In Instagram they can know which page i am visiting even i checking specific insta account pic and reading comments even i am checking all the comments by clicking the + sign.
3. They can share particular video on my YouTube feed e.g a movie clip from a you tube account they created just to track me through IP Address Tracking.

Answer 1

Answer to Q1:

Yes, but the primary tracker would be Google, though they may choose to share it with third-party vendors who may choose (or are made) to share that information with the government (or sell that to an individual).

Non-important information such as video quality are usually considered information collected to improve performance (i.e. they're not sensitive information), but other things like watch history might be considered PII (personally-identifiable information) so they're subject to stricter anonymization.

Answer to Q2:

Yes, this is quite trivial to do. As a service provider, when a user is requesting to see a user's page, they're doing so by requesting your server to serve back that data, so it's really trivial to just record when a user sees another user's information. This applies to almost everything that you use online.

Answer to Q3:

I'm not sure what the third point really means, but tracking through IP is quite trivial. Although IP addresses may change very frequently, tracking IP addresses allow advertisement providers to track a group of user within a particular area/region to gather information about that locality and serve more relevant advertisement/information.