Here it is not mentioned in which file or directory we have to add this code for breadcrumbs...Please help here so that i can continue ahead
First, please read this.
Second, always include a link to the web page in question.
Finally, I don't have an answer for you, but when you do get an answer, would you please submit either an issue or pull request to address this in the Plone training repository?
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Generally, Support explains how to get Plone support.
It includes How to Ask for Help, which states that text tracebacks and error messages are what you should include when you need help.
This training is from 2019, and may not have been kept up to date.