Whatever

Read books: Go to the library, lend a book from a friend

knitting, crochet, embroidery: Get some needles from the bargan store and ask around, people have leftovers from projects they'll happily give you. Thrift stores also often carry leftover fabric and other supplies. And talk about your hobby loud enough and an old lady will show up and gift you their whole collection, because there are way more old ladies with a closet full of wool than there are grandchildren who want to take up the hobby.

Origami/paper crafts: get some scrap paper and scissors, watch a youtube tutorial

walking: put on shoes open door

pilates/yoga/etc: get a mat or just use your carpet, watch a youtube tutorial

Houseplants: look online for people that swap plant cuttings. There are always people giving out stuff for free to get you started. If you're nice enough you'll probably get extra

gardening: You're gonna need some space for this one of course but you can just play around with seeds and cuttings from your grocery vegetables.

aquarium keeping is a bit of an obscure one but I got most of my stuff second hand for cheap or free and now I have a few thousand euro worth of material and plants.

drawing/art: You get very far just playing with bargan store materials. I did my entire art degree with mostly those.

writing: Rotate a cow in your head for free

cooking: again one you can make very expensive, but there are many budget recipes online for free. Look for African or Asian shops to get good rice and cheap spices.

Join a non-profit: Cities will have creative organisations who let you use woodworking machines or screen presses or laser cutters or 3D printers etc etc etc for a small fee. Some libraries also lend out materials.

candle making: You need some molds (cheap), wick, two old cooking pots for au bain marie melting and a ton of scrap candles, ask people to keep them aside for you.

a herbarium, flower pressing: Leaves are free, wildflowers too, ask if you can take from peoples gardens.

puzzles: thrift stores, your grandma probably

Citizen science: look for projects in your area or get the iNaturalist app

And lastly and most importantly: Share! Share your supllies, share your knowledge. Surround yourself with other creative people and before you know it someone will give you a pot of homemade jam and when you want to paint your kabinet someone will have leftover paint in just the right color and you can give them a homemade candle in return and everyone is having fun and building skills and friendships and not a cent is exchanged. We have always lived like this, it's what humans are build to do.

And all of it sure beats sitting behind a computer going "No stranger, I refuse to let myself have a good time."

Crosswords and other word puzzles - lots of free sites

Learn a language - Duolingo is free, among other apps

Photography - Most people have smartphones these days that actually have decent enough cameras that could suffice for beginners and intermediates - the important part is your eye and the composition, etc. Plus there are free Photoshop-like sites for editing, like pixlr.com. Also you can find old, great quality DSLRs that still work for cheap! They’re not like cell phones lol; my Canon is almost 20 years old and works like a charm. And good ol' YouTube University can give you beginner lessons if you don't know what to look for or how to get started.

Journaling (and/or bullet journaling)

Read lyrics along with songs while listening to them. If you don’t have Spotify, there are tons of free lyric websites out there.

Research an unfamiliar topic either online at home or at the library.

Forget stovetop vs electric, in my experience the fiercest argument is between people who think a kettle is an essential household item and people who do not.