The general rule of thumb about not buying anything with a motor or something that relies on quality hardened steel without reading reviews first should save you from most of the HF pitfalls. Some motorized things are OK, like the belt sander mentioned above, but most will be a major disappointment for long term use.
Things I absolutely recommend:
Deadblows - outlast $70 deadblows I’ve tried. Yes, I tried $70 deadblows for work, and the HF deadblows average 3-4x longer life for 15% of the price. The HF version is cheap, no frills, but work great.
Fiberglass handled hammers - more than adequate for anyone who isn’t using it for work.
Multi-tip screwdrivers - I generally lose them before they wear out, be careful to only buy when on sale or they’re not really any cheaper than the hardware store.
Heat gun - I’ve been surprised at the longevity of the one I bought. Not “high quality” but like the fiberglass handled hammers, good enough for anyone not using it for work. Be warned it smells awful the first couple times you run it.
Storage bins, totes, bags - Generally good prices on products often identical to major brand versions. I’m especially fond of their black and yellow storage cases. They have a couple sizes. I can see 5 I’m using from where I’m sitting right now in my garage.
Harbor Freight Storage case
Scissors - their black and red scissors are exceptionally handy for $.99 each
Furniture Dollies - I use them all the time, my wife just stole 2 from me for plant stands inside. I’ve used them for so many things it’s mind boggling. Highly recommended when they are on sale.
Chain hoist - like the hammers and heat gun, it just works. Buy one with 30% more capacity than you need to give you some safety factor and it’s still a good price for a chain hoist. My 1 ton is great for occasional lifting of heavy things out of the back of a truck in the garage, truck drives out, heavy thing gets set on ground or dollies.
You might see a pattern, if you’re a professional, Harbor Freight has very little to interest you (but there are some gems). If you are a homeowner or hobbyist on a budget there is a lot more to be excited about, but be warned that you’ll get the occasional piece of garbage that you need to return due to poor QC, design, or both, so it pays to read real reviews of what you’re going to buy there if your time and money are precious to you, and consider how much you’ll be using what you buy. Sometimes cheap is cheap, and sometimes cheap is expensive.