A few things I've learned from experience:
- There's a bit of a hivemind on the internet regarding what is desirable in knives. Talking points will be parroted without verification of accuracy quite often. You can have twenty people tell you the same wrong thing.
- Never get caught up in hype over anything. Wait for facts and make sure what you are considering buying is both something that actually fits what you want (make no compromises, you'll regret them) and that it is at a price you won't regret if you end up trading or reselling it.
- You WILL be greatly disappointed more than once. You'll find a knife that seems to have it all, and it'll be a huge letdown. This is why you should shop around for a good price, take all glowing reviews with a grain of salt, and research thoroughly.
- Gerber folders are basically garbage.
- As someone who is a bit of a steel snob, i have found that there is not a huge difference in edge retention in the blade steels you will find in the 30-80 dollar range (VG-10 , AUS8, 8Cr13MoV, 440C), and it gets about 40% better but still just as interchangeable in the 90-170 range (S30V, 154CM). There are always exceptions. Research.
- Nano lube, tuff glide, and wiha are the best lubricant, corrosion preventative, and torx bit makers that I've found to date, respectively.
- Sharpening is an invaluable skill, and it takes a lot of time and practice to become proficient at. A strop, set of diamond stones, and some ceramic stones will serve you well. There is no steel so amazing that you will never have to sharpen it.
- it doesn't matter how cool a knife looks or what materials are used if you won't use the knife.
- Price doesn't always reflect quality. There are 150 dollar bokers that have the same build quality and materials as $30 ontarios, and there are $50 Spydercos with less functionality than $25 cold steel knives. Every knife is different. If the price seems too high, it is.
- Cheap folders have their place. My $25 Cold Steel Tuff Lite sees far more use than anything I own over $100. It's all about what you will use and for what. Don't spend 200 dollars on a knife that you won't use.
- Design is almost always more important than the materials used. A knife made with titanium and premium steel is still a poor tool if the blade shape or grind won't suit your uses.
- Warranties are your friend. There are always variances and mistakes even in very pricy knives.
- You don't NEED that next knife. Be patient, and you may find that you decide against getting something that the previous day you would have chopped off an arm for. Waiting will save you a lot of frustration and money.
- Never buy anything from an individual sight unseen. Pictures and videos are necessities, as you will find the words "Perfect", "new", "mint", "centered", and "sharp" mean very different things to different people. Be your own judge of condition. Be as honest as possible when making descriptions, too.