I'm writing a mail to my juniors and sharing a document with them in it. The document includes some links to videos and articles to help them understand a particular topic. I'm referring to these articles and videos by 'videos and articles' every time. I know it's not wrong but still, it looks very odd to mention these words again and again. Can anyone suggest a synonym or an alternative to it?
Most generally they could be called sources or information sources. This is a mostly context-neutral way to phrase it and does not imply how the articles and videos should be used.
Another word you could use is references, which implies an information source about a specific topic or category of knowledge. It also implies that the information is provided on an as-needed basis, rather than a mandatory one.
Finally, in the most formal and academic of contexts, these could be called supplemental materials. The word supplement refers to something that completes or supports something else, or makes up for a deficiency elsewhere. The implication is that these materials support and reinforce knowledge, but aren't required to be read or viewed.