I have read several books on the topic of Zero Waste, and found it to be a very fascinating idea. I quickly realized that there is no way I or my family can be fully zero waste, because so many of the things we use on a regular basis don't work with that lifestyle commitment. However, I am trying to move toward reducing/eliminating any garbage produced by me that will outlive me, and using natural items instead of plastic ones when I can. People who live zero waste have a lot of great ideas for more sustainable living.
Sometimes I get on a tunnel-vision sort of focus and end up focusing on things that, in the long run, aren't going to make that much of a difference, but cost a lot of money. So I like what one of the early posters said in this thread, that it's a good idea to wait till the end of something's life cycle to replace it, or reuse non-biodegradable items that are already out there in the world.
I am embarrassed to say it, but I didn't know that plastic and polyester comes from petroleum! I don't typically buy a lot of clothing, because I usually wear what I have for years, but my most recent project is trying to make sure any new clothing is something made of natural fibers like cotton, linen, wool, etc., that will decompose after it's not wearable. I've found that these types of purchases are 1) difficult to find if you don't make your own clothing, and 2) really pricey... so I've been focusing a lot on thrifting anything that I need for now. At least I won't be contributing to new items that will turn into garbage that outlives me.
I also have tried, in the last 4 months, to save as much food packaging plastic and mailing plastic as possible, and wash/dry it. I wasn't aware that I could return a lot of the bags to the grocery store for recycling. I live in a rural area with long winters, and there are allergies in the family, so we can't utilize bulk/no-container stores, and have a lot of plastic packaging from things we must buy or receive mail-order.
This weekend, I did a plastic audit on all of my non-recyclable plastic after 4 months. Most of the non-recyclable plastic I have comes from things that need multi-layer bags, such as freezer vegetables (not eaten weekly, but eaten occasionally, and it adds up), rice & chocolate bags, and potato bags. I am going to freeze fresh corn today, and that will cut out several plastic bags over the course of this year. We also eat a lot of frozen peas, but I haven't gotten around to researching how to preserve them, and I didn't grow any. I saw online that there might be a company that makes a recyclable bag that I can switch to when I buy frozen peas for this year. Potatoes, I have been buying in a paper bag from a local grower, and am considering stocking up and storing some for the near future. I really wanted to grow my own crop of potatoes this year, as I have in other years, but I wasn't able to. I need to look into whether there is a good way to buy rice in a very large bag and store it for the year, which would probably be cheaper and reduce plastic waste. I had a bin of rice and beans from the Covid era, just in case SHTF, but it's all past it's use date by now, and I ended up feeding it to my dog, so we could probably benefit from a more organized rice storage system!
I planned to upcycle my leftover plastic into fused plastic sheets and sew them into reusable shopping bags, but I tried this over the weekend with my 4-month stash of non-recyclable plastic, and it just took a lot of time and didn't look very aesthetically pleasing at all. It might make a fun project for a weekend, especially with kids, but I don't think it's realistic to try to do this regularly. I got really enthusiastic considering that I might be able to fuse plastic and create garden covers for weeds! The only thing I'm not sure about is whether this method is safe. I went on a kind of manic information binge this weekend trying to figure out where I can put this non-recyclable plastic to good use. I read that there are concerns about plastic that is turned into building materials, because it is not meant to sit in the sun, and may contaminate the soil. I did see one interesting company that creates building materials of plastic, but covers it with something that can keep it from leeching into the soil. So I am curious to look into whether or not I can use my fused plastic, or if I can use it if I cover it with something else. Not sure what that would be or how I would do it.
Other switches inspired by zero wasters over the years... of course, trying to avoid single-use plastics as much as possible. I am planning to get some cheap silverware and sew several fabric silverware kits to store in the car, but of course, I have many more things on my list to do than I seem to find time or energy to do. We also use glass as much as possible in the kitchen--we store food in glass containers with plastic tops, so the plastic tops can be replaced when necessary, and the glass lasts a long, long time. I also have replaced plastic pitchers and stuff like that with glass, which was a little bit of an adjustment as far as handling everyday items, but overall, was an easy switch.
We have also gotten into the habit of taking water in thermoses wherever we go. This past year, I also sewed a bunch of reusable feminine hygiene products, which has reduced a lot of plastic waste. I used to consume fast food a fair amount... not every week, but often, mostly when I was tired or busy. So I've managed to basically cut out fast food altogether, which has been good for my wallet, health, and the planet.
I've switched to bamboo toothbrushes and tooth tablets, which was weird at first, but now pretty normal. I also made a batch of my own laundry soap, which worked wonderfully, but I haven't kept up with my castile soap making, and had to switch back to a powdered detergent. I tried some plastic-free laundry sheets, but they are just insanely pricey, and I do several loads of laundry most days. I also switched to the Grove brand dish soap that they sell in aluminum containers at Target. I heard that you can use regular soap to wash dishes, but dishes are another thing I do constantly throughout the day, so I didn't think I should try to mess around with that. I am concerned that I will do it wrong and end up backed up on dishes due to soap scum. I bought the Grove plastic-free dishwasher pods, but again, they are really pricey, so I need to find a different solution. I made my own dishwasher powder before, but it ended up leaving the dishes kind of streaky, so I either need to try that again and tweak it, or maybe look for a cardboard container that has powder and costs a lot less to use. (I know a lot of those cardboard containers are lined with plastic, so I still haven't found a great solution, but I'm thinking about it...)
There have been a few times over the last year where I've gotten take-out food (which we generally don't do much--we mostly cook and eat at home) and I was too shy to ask to use my own container! So I still have to work up the courage to work out a system for the few times throughout the year that I may need to have takeaway food.
Sorry if this is boring to those of you who are way ahead of me or have a full homestead and don't think about things like takeaway food or dishwashers!

I would love to have a full homestead, but it's not something feasible right now, so I'm just doing the best I can with the situation I have currently.