Memories are often incomplete and subject to the brain reinterpreting things. What if you half remember someplace or have some subtle difference wrong (green door vs blue)? What if you have a painting of a place and imagine the place vividly? What if the place has changed since you were there last (house torn down, earthquake caused the land to shift, house was moved so you remember the house but it's in a new location)?

For that matter, how is place determined? The Earth is in a different location than it was seconds ago, so is place all by association? Can you thus teleport to an object? A person? What if you only experienced a place with limited senses (blindfolded)? Can you teleport to someplace you can see, but haven't actually been to (the next hill, for example)? Sorry, I see a lot of opportunities and complexities to this question that are hard to explain without answers.

Is energy conserved in any way? This makes an instant machine with people teleporting to the top of a wheel. Really large people would teleport more mass, and I assume teleporting takes no effort, so gaining weight would increase your capacity to teleport. But I suspect this would cripple civilization and lead to a perpetual stone-age culture. Predators can't get you, prey can't avoid you, and stealing is super-easy so portable wealth, food, or tools are easier to steal than make. Is velocity conserved? If you fall, and teleport home, do you die when you hit the floor of your home?

@DWKraus They just need to vaguely remember a place. If you are blind you can still teleport but you do need a little more sense of where it is. a place is where the person's brain has been before. Energy might be conserved might not. the cost of teleporting is that it feels like you are Carrying 1/6 the weight you teleport for about 3 minutes. that's why you can only bring 5x your weight maximum. Human's can only Carry their own weight.

you may want to read the long earth series by Pratchett, he shows serval implications of this, including the evolution of predators exploiting it.

@John I'll look into that

You invented a world where the morbidly obese would be a logistical asset, that is interesting. A 155 lb person could transport 775lbs, a 900 lb person could haul 4500lbs anywhere they'd ever been. And they really don't ever need to walk anywhere.

does teleportation tire them at all? If I spend all day teleporting rocks down from the mountains is it the same effort as sitting on my butt all day?

@John he did say teleportation has the cost of feeling like you were carrying 1/6 of all the weight including the person’s body. so I expect it to take a bit of energy in the form of calories, brain power, or muscle mass.

Why are those things cons? It's like saying, that we have cars - pros: they go faster. cons: no more horse poop on the roads. Wait, people didn't want horse poop on the roads in the first place. How is that a con?

Am I reading this wrong or is there an inconsistency: can teleport to anywhere they have been before even if they forgot how to go there. and ` and if anyone forgets a place they've been they can not go there.`

If I can see a place, can I teleport there even if I have not been there? Mountain top, the moon, etc. Once to the moon, once to wherever. How much stuff can I carry with me? Do we need roads for building materials, food, machines, etc.?

What happens if multiple people want to teleport to the same place at the same time? Do their bodies merge? What if they're trying to teleport to a cave that's caved in? Do they get instantly crushed? What about trying to teleport underwater? Where does the water go? And what if they're trying to teleport to the 50th floor of a skyscraper that has been torn down? Do they just fall until they choose to teleport again?