Can not receive CAN DATA from Arduino UNO with MCP2515 Module.

Using Arduino Networking, Protocols, and Devices
33

Regarding CAN library I am a bit confused.

In early 2016 I used the library from SEEED studio. This worked fine for my experiments.
However there was no support for other than 16 MHz Q.

Then in 2016 I used The library from Cory Fowler, and also changed some of my code. In this library there are support also for 8 MHz Q (and other).
I also noticed not to use "CAN.getCanId(); ".

Now I see a new library from Adlerweb and still the use of "CAN.getCanId();

As I am new to this I would appreciate some clarifications.

And what library to use.