As much as I'd like to turn the internet off for an extended digital detox the infrastructure to go back to how things were before the net isn't there anymore, so I guess this is a fair question to ask.
Without the internet the pace of life was slower and on balance that's not a bad thing for everyday living (it's another story with advanced academia and medicine).
I don't think school was actually much different. Teachers still curate what you research online for your lessons otherwise classes would lack focus. In my day we went to the library and learned how to use it efficiently by making searches in the card catalogue which someone else had spent forever compiling so you could do subject searches, keyword searches, publication, and author searches. Basically, like doing it online, but with index cards! Archived material like old periodicals and sometimes rare books, were photographed on microfilm and microfiche in order not to take up so much space. You needed a special machine to read them and felt like being in a James Bond film.
The library was the port of call for so much information, like finding out about community events. It also held things like the post office registry, local business accounts (in the UK at least, it had a proper name I can't recall right now) so you could check how long a business had been going and its turnover and stability rating when you were sending out your CVs if it seemed like a promising place to work. They also held things like directories of scholarships to apply for. Librarians were very knowledgeable and if you were polite they could make your life so much easier.
The phone was used for SPEAKING and boy did people use it. A lot of things you'd email or WhatsApp about now you'd call someone about. It was good because you built up a rapport with people you interacted with often. There were a lot of automated phone services too. Some are still around, though they seem to cost more now. Back then they were free or negligible. There was the talking clock if you needed to reset your clock, the weather on a loop on another number. Director of Enquiries to help you find a number if you couldn't locate it in the phone book (a new one came every year, well two, one for businesses and another for residents).
The bus time table for the year used to be delivered once a year at my parents' house. You could buy extras at the post office.
If you wanted to travel further you called up the airline or train operator and someone on the other end of the line helped you plan your journey and then mailed out the tickets, but if you wanted a vacation with the works you'd make an adventure out of visiting a travel agent.
The local press was very active, so you got to know what was going on that way. The regular local paper would carry reviews for movies, restaurants and other attractions. They'd have the movie timetables and tv schedule too. Things like conventions coming to town would take out ads in the paper. The paper would also carry the classifieds which was like Craig's List or Gumtree. That's where you bought and sold second hand stuff, found rooms to rent, and dubious people to date. On the weekends there were thick supplements. The grocery store offers are still around, but there used to be really thick supplements with all the nice houses for sale collected from all the real estate agents in the area. (Later local cable tv started showing houses for sale too on a loop.) Clothes companies sometimes included thin "taster" magazines with just some of their lines if they were a little more niche. If you liked it you could write and ask for their full catalog.
There were specialist classified magazines for people who bought and sold special collector items. Since their reach was further they were published less frequently. Like I said, the pace was slower.
Mail order shopping was done via catalog. The "major" catalogs arrive twice a year with holiday supplements. You ordered by either phoning the helpline or by sending off an order form listing the item numbers you wanted. Everything was 6 - 8 weeks for delivery, I don't miss that part.
You paid your bills at the post office counter, the bank, or by posting a cheque. Most people paid the utility bills quarterly if they weren't on a coin operated meter, so it wasn't like running to pay 24/7. The period you had to pay up was longer two so many people would save up a month's worth of bills just to sit down and pay them in one session and then not have to think about it again.
The "bad" side of social media was the graffiti on toilet cubicle walls. It's so much less creative and person now. The bad side was more potential people to see it. The good side was that it only lasted until painted over.
Your immediate world was smaller and more intense. There were bad sides if you really didn't fit in, but there were good sides too. Because you had to use your local resources people were more careful not to burn their bridges. People were a bit better about agreeing to disagree about who to vote for as long as you didn't let your leaves blow all over your neighbor's lawn. People talked to each other more. You asked about how to choose a restaurant? Well, there were reviews, but since the number of stores you shopped at were both fewer and you had to go out to buy something unless you could wait 6 - 8 weeks you start to recognize people. Not friends exactly, but someone you're glad to see because they're familiar, and so there was, as there still is, chitchat. If a new place opens up, you will know about it, and so too if service takes a nosedive elsewhere. Now there's so much more information that I'm not sure it's better. Don't you fall down the rabbit hole over researching something and end up with choice paralysis at the end of it? I'd like those hours back, please!