How to understand the parameters of a transistor
These are model parameters. In a circuit simulator a model is used to simulate the behavior of a transistor. One of the simplest models is the Transistor diode model

More commonly used by circuit designers is the Hybrid Pi model, this is a linearized (small signal) model.

The list goes on, there are many models.

The model used by the simulator will be even more complex than both models mentioned above. Complex models need many parameters to "tune" the model such that it not only behaves as an NPN transistor but as a BC547 or 2n2222 or 2n3055 in particular. These are all NPNs but have very different maximum currents and beta (current gain) to name only two.

Some examples of model parameters:
R_B: base series resistance
R_C: collector series resistance
C_JC0: Junction capacitance
B_F: Foward mode current gain

See more here: Spice Model