Could you elaborate or point to a resource? AFAIK, term "strongly typed" is usually used to refer to that the type cannot change but I'm failing to find a well defined definition or the comparison against statically typed.
Strong typing means that types cannot be substituted for other types. In C, you can write `int x = "one"` and the char * (address of) "one" is automatically converted to an int, or in Javascript you can write 1 + "2" and a string "1" is automatically created; depending who you're talking to, either or both of these qualify as weak typing.
They're both spectrums, and commonly confused with each other.
When you say the type cannot change, that's ambiguous: do you mean the type of the value a variable holds, or the type of the value itself? In C (a statically typed language), "int x" means that x will always hold an int, but you can still assign a pointer to it, it just turns into an int (weak typing). In Python (a dynamically typed language), the variable "x" wouldn't have a type (so it could hold an int at one point and a string later), but the value it holds does, and because it's strongly typed, it would throw a type error if you attempted to use it in a place where it wanted a different type (eg, `1 + "2"` does not turn 1 into a string or "2" into an int).
Professor Bob Harper of CMU would refer to Python as unityped, i.e. having a single type: https://existentialtype.wordpress.com/2011/03/19/dynamic-lan...