Welcome to the forums.
Its good to see you are asking the right questions from the start.
Yes, these are the knives your mother warned you about. If you buy one you are going to find that it may not have an edge, that you may not be able to sharpen it, and that if you do get some kind of an edge it will be gone in no time at all. Which is probably a good thing since if these knives actually had an edge they would quickly cut through the cheap sheath and stab you. You can count on these knives to fall apart with the slightest use.
My younger brother bought one of these when he was about 8 (twenty five years ago). It was one of the survival models. No edge, no edge bevel (the edge was about 1/8" thick!, oh and yes it fell apart as soon as he opened the package. Stay away! There are far better knives out there for just a few more dollars.