For managing some of the information that google accumulates about you -
https://support.google.com/accounts/answer/465?co=GENIE.Platform%3DDesktop&hl=enYour cellphone usage and how you move through the city during the day and unless you use a VPN they also record what websites you visit as you move. A few US carriers allow you to pay to opt out of this tracking, but the last time I checked there was only one.
Your usage of "social media" websites, e.g. facebook is by far the most dangerous. Facebook has a vested interest in selecting stories to show you that are going to elicit a click or response and for-certain they track both what news websites you go to and what shopping websites you have visited, they know which way you lean politically, your approx. age, and your income demographic... It also now seems that law enforcement (in the US) can legally demand access to your facebook account (e.g. returning from overseas trips).. Did you like a post criticizing a current or former policy of the government? Do you have friends who might have made such posts? Then US Border control can, and is expected, to go to great lengths to "protect the US border". I'm not saying give up on facebook altogether, but use it selectively (e.g. using it to coordinate meetups with friends is a great low risk option).
What can you do if this bothers you?
#1 Let your representatives know you do _NOT_ want ISPs to be allowed to track your itnernet usage, and you do not want to allow them to resell this history (this sadly was a new change that just recently passed into law)
#2 When web browsing, if you choose to open a new "private" or "incognito" it's a bit harder for sites to track your shopping interests as you move to other sites (though, if you're using amazon they obviously know who you are if you login!). If you're especially worried you might have a different web browser (e.g. Firefox, instead of Chrome) that you exclusively use for a subsets of sites (e.g. only visit your banking website with Firefox - make sure whichever web browser you use you regularly check it for updates)
#3 Any website you use (unless you're paying for the service AND they've disclosed their tracking policy) is almost certainly directly or indirectly tracking you... this isn't always a horrible thing - websites need to pay costs (servers, bandwidth, salaries for their writers to create the content you view/read.) This content is paid for by selling ads... The point is, be aware that everything you do online is likely a means for someone else to sell ads to you.
#4 Don't freak out, but do be aware that this is tracking is happening.