I mentioned in my online habits section the concept of knowingly handing out false information. This is probably one of the most powerful techniques for perserving your privacy in a digital world. However, it's important to understand how to use this properly lest you land yourself in some hot legal water.
What Not to Do
Never knowingly give false information on a legal document, to a law enforcement officer, to a federal agency, to the IRS, or to medical personnel. Honestly that pretty much sums it up. When using disinformaiton as a strategy, the main question to ask yourself is "does this person need the information they are requesting?" Does a cop need your real name when pulling you over? Yes. It's illegal to lie to the police when they are performing official duties. Does your doctor need your real contact information? Yes. Does the IRS need your real social security number? Absolutely. Does Facebook need your phone number? Absolultely not.
What to Do
In almost all situations, the best defense is invisibility. Rather than providing false information, you should see to provide as little information as possible. When being asked to fill out a form, don't be afraid to ask "what information on this is actually mandatory? What parts do you need?" Privacy is becoming less stigmatized these days as data breaches continue to happen on an almost-daily basis. As long as you're not obnoxious, most clerks will be willing to find out what information is mandatory. Sometimes this is pretty obvious. Again, does Applebee's actually need your email? No, not really. Does your doctor actually need your home address? Maybe not. Maybe a PO Box is okay. Ask.
Once you know what information is required, you're now faced with the decision only you can answer of what information to provide and what to fake. Like many people, I do my fair share of online shopping. A name and address is needed, so I use a generic name and a PO Box. An email and a phone number are both required. For email, I'll use an email masking service. After all, I do want updates on my item and I can always delete the address if it ges too spammy. For phone number, I use my area code plus 867-5309, which is from a hit 80's pop song. They don't need my number. They have my email (so they think). They have a way to contact me with any problems. I'm probably too busy to answer during the day anyways.
What about taking my cats to the vet? I book the appointment online using a masked email. If any phone numbers are required, I give a fake number. If any address is required, I have a hotel nearby saved in m notes. I pay in cash. I don't need the vet selling my information to various pet-care companies who are going to spam me with crap they don't need. They're cats. Give them an empy egg crate in the sun and they're happy. As I type this, one of them is sleeping on the couch and the other is in the window sill. Neither of them are paying any attention to either cat tree or the myriad of toys.
Finally, an important part of this strategy is to have both excuses and addresses on hand for everything. I have a list of numbers and addresses saved in my notes. If someone asks for one I haven't memorized, I pull out my phone and make the excuse "sorry, I just moved so I haven't memorized my address yet" or "sorry, I just switched phone providers and I haven't memorized my new number yet." I like to have a variety of addresses to pull from in the local area. Some are quite close by. Others are in surrounding towns up to an hour away. Whatever backs up my story. Public libraries, hotels, and other public buildings are all great choices here. Typically only official businesses - like the DMV or a bank - will be verifying those addresses, and in those situations you shouldn't be lying anyways.
Remember: the big question is "does this person need this piece of information?" Treat every request for information as a data breach waiting to happen.