I have joined several reselling groups on Facebook. They have proven to be an enormous source of information from everything not to sell (TY toys, Lulamon, etc) (and I have a few to add, like Funko toys! you really have to know your stuff to move that crap).
What is most helpful is how to source, what to source, and how to package it so it arrives unbroken. Shipping is difficult at first and takes some time to educate yourself on how to do it without getting burnt.
I have begun to order boxes from ebay and the post office has some free stuff for priority mailing but you must be careful to not inadvertently use a flat rate box. YIKES. They are a good thing at times, but not all the time.
These groups always have someone asking "What should I sell" and the people in the group are brutal. Sell what you know!! Find out on your own. Don't ask us to do all the work and then hand it over to you. Another question asked constantly is "what do you sell" when someone is boasting about 15 grand in sales in a 90 day period. The answer is always very cagey and usually is "A little bit of everything".
Recently someone asked, "where do you source?" and she received all sorts of snarky answers, some people can be very rude and condescending. I know a lot of them go dumpster diving and road side trolling. There is a great blog about things I find in the garbage. That guy has a guardian angel named Lucky.
It made me think about where I source from. Definitely not from my closet, though I do have a pair of Frye boots circa 1970 that I acquired from Ebay in the 'naughts for $10. I bet I can flip them now for a lot more!
I score from SSTC and that stuff usually is very good. Some of it may take a while to sell, like the porcelain dolls, b ut I did move 3 for $20 and made my money back and have a slew more to go which will be all profit once I do. I source from two other auction companies and I generally go after the jewelry because I can get a lot for 60$ to 120$ and piece meal it off and make my money back quick and easy.
The bins! God I love the bins but I always buy way too much and my death pile is enormous. I have too many clothes and never have them posted. Boo hoo. But when I do, I can usually sell them. I look for vintage and unusual things in the bins.
I can flip shoes.
I like FB Marketplace to source. I have found Birks that are a stinky mess that I have not flipped yet. I scored another pair and after reading up (from one of the FB groups) how to clean them, I will offer them together and try to turn a profit. I found a lot of Concert Band t-shirts that I have sold most of, given one to Bridget and can't find another and have two left over. Any one like Asking Alexandria?
And I have had no luck at garage sales. Maybe because I'm not comfortable at them. I need Joe to go with me. Estate sales have been not so good, but I did score three Mattel dolls.
Learning Curve.
BTW two packages heading out in a few minutes. Elvis and mismatched vintage earrings.