Where do I download the Xcel files that I need to use on the training course?
Hi @Andrei_Avram and welcome to the forum.
Course materials are located on the KNIME Community Hub here:
Be sure to log in (very important!) - then you can download the entire archive for the course you are interested in, which includes all workflows and data needed.
Then import the KNAR file you just downloaded into KNIME. 
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