Imagine you have a toy that looks the same when you turn it around. This means it has something called "symmetry". Now, imagine you can also flip the toy over, and it still looks the same. This is called "point symmetry".
A lie point symmetry is a little bit trickier, but it's like having two or more toys with point symmetry that you can mix together to make a new toy that still has point symmetry.
For example, imagine you have a toy car and a toy train, and they both have point symmetry. You can take the front of the car and the back of the train, put them together, and make a new toy that still looks the same when you flip it over. This is called a lie point symmetry because you are using two or more toys with point symmetry to make an even fancier toy with symmetrical properties.