EDIT: Hardware is compromised. OPSEC is using hardware and connection not related to you. Change your habits and typing style when you do as these can still be used to identify you. Everything else is futile. We live in an open prison. Enjoy goats :)
Are you using Windows? You've already failed, closed source code, backdoors galore. Take it for granted that whatever is on your screen right now they can see it. They already know all your passwords that you have typed in whilst using a Windows system. Everything you have done on Windows is compromised.
Learn Linux, if you think it's 'too hard', or you 'can't be bothered', you are a useless sack of shit that is of no use to anyone. Linux comes in many varieties all of which are free to download and use. A few examples of the many below;
Ubuntu - Good replacement for windows, similar, but not focused on privacy.
Tails - Focused on privacy but not suited for everyday use.
MOFO Linux - Focused on privacy and comes with useful apps installed.
The last two can be run off of a USB stick, you store your files and information encrypted on another USB stick. When you power off the computer or remove it you are left with a fresh operating system with no history of being used on one stick, and the other stick encrypted with your information on it.
I won't go into too much detail but a good rule is longer is better, and can also be easier to remember. For example "H!la8y_Cl1nt0n" is 12 characters long, on an i5 processor it would take roughly 200 years to crack. Sounds good until you put the power of 10,000 computers towards cracking it (not unfeasible if they want to) and it will only take a week. Now the password "R0nRabb1tR0nRabb1tR0nRabb1tR0n_****" is 35 characters and is easier to remember than the first. Using symbols and numbers is still important to avoid dictionary hacking. I can't even work out the math behind how long it would take to crack this password as it is just that STRONG. Long passwords can be dictionary hacked if you neglect to use symbols and numbers and only use whole words so this is important.
Veracrypt is good for encryption, and can create hidden partitions, for example you could fill it up with some porn (encrypted), and have your sensitive information in the hidden partition. You also have 2 passwords, depending on which one you enter you can either access the porn or the sensitive information. Now if you are forced to decrypt your encrypted data under duress you can unlock the porn and the sensitive information will still be hidden and it won't look like you are being obstructive.
Ditch anything Google, ditch it, now.
People should also be using VPN's for obvious reasons. I STRONGLY advise getting a router that will allow you to load OpenVPN configurations on to it, as doing this at the router level avoids software errors on the computer side from exposing you.
They are always sending information to towers that can be used to track you, if your data is actually going to a real tower and not one of the fake ones they set up to scrape your data as a man-in-the-middle attack in the first place. If you don't want to be tracked don't have one on you.
As more and more oppressive measures are being taken against those not embracing the globohomo open borders surrender your nation status quo that is being forced upon us, people need to start taking their OP-SEC seriously. I'm not recommending you do anything illegal, I'm suggesting you cover your ass from the incoming oppressive measures. We all have a bit of knowledge, and collectively, we have a lot of knowledge. If you know of hardware that is compromised, talk about it, if you know of a VPN operator that is compromised, talk about it. Lets get a discussion going that can help other goats out :)