Pretty much every item of clothing I own is from the thrift store or has been second handed in some way. I love being able to find clothes that are more my style without the $70+ price tags and I'm able to maintain a business casual wardrobe required for my office.

Furniture that isn't beds are all second hand as well, I just steam clean everything upholstered. Buying brand new is a money making sham that only fills our landfills unnecessarily.

Also, learning how to cook has saved us a lot of money of takeout and prepackaged meals. There are so many ways to learn now too.

We also no longer own a vehicle, we walk, bike, or transit everywhere. I do maintain a license so I can rent a car when necessary though. Vehicles nickle and dime you to death when you own the outright or cost a years wages or so to buy, plus gas and insurance prices are insane. It costs me $500 a year to ride the bus.

https://freecycle.org

Get to know a gardener or forager. Both are cheap and healthy pastimes that provide great food and save money.

steal

A hot water bottle to stay warm in winter. Also a really good tip if you're not poor.

Never buy plastic/paper/whatever bags in supermarkets. Bring yours and if you forgot them for whatever reason, lurk for trailing cardboard boxes. Supermarket are often filled with those. They are solids and the supermarket is going to thrash so they don't care.

Same when you move out, don't buy boxes. Go to your local library to ask them to put aside some cardboard boxes for you. Books cardboard boxes are really solid and always clean. When you are there you can also buy Mutual Aid: A Factor of Evolution by Kropotkin.

Make a youtube compilation channel and profit off of other people's content.

Buy a 6 pack of good wool balls. Finish up using your fabric softener first and never buy any again.

Go to Germany to get groceries cheaper and VAT free.

If you do have debts - try to consolidate them wherever possible. Don't have more than one credit card adjacent means of payment (store credit cards or similar).

If you find yourself with extra money, try to pay off debts first, or at least make extra payments. Reducing debt repayments over the forward term can have a huge effect.

Thrift stores out of season. Look for your winter jacket in June, you'll get the nicer brands, and most thrift stores will do some kind of rotating discount on certain colored tags. Most 'dry clean only' items can indeed be machine washed on gentle.

Preserved and frozen meats and fish can be made into fantastic recipes. We do salsa chicken straight from frozen in the instant pot, and I make a killer pasta with tinned sardines and breadcrumbs. The benefit of these is that you can buy them on sale and don't have to worry about cooking them quickly to avoid spoiling.

Drugstore makeup can be just as good as expensive stuff. Aldi moisturizers are incredible and $4 a pot. I splash out on super expensive shampoo and conditioner, so I don't have reccs there, but my husband swears by Aldi's black and white bottle stuff.

And this tip is a little wild, but learning to forage can be immense. There is so much free edible food around you, from flowers and leaves that make delicious tea (passiflora flowers), weeds that can substitute salad greens (lambs quarters, kudzu, and wood sorrel), to absolutely delicious fruit that you couldn't even buy if you wanted to (pawpaws!). Use the golden rules of having three different ways to identify it (three sources, don't just use photo ID apps, learn the description, not just the visuals) and also know the sickly lookalikes, and never forage for carrots or parsley.