Someone recently told me that using numbers in web page file names is not good practice. For example, say I was making a website about Samara Morgan and I had a file named 7days.html - would it be bad to start the file name with a number? Is it riskier than having numbers put later in the file name (ie. day7.html)?
I'm just a tad confused on whether it's generally discouraged to use numbers in file names or not.
EDIT: After asking them to explain a bit more, this is what they said to me:
.... the simplest way I can explain it is that certain programming languages and operating systems might be confused by putting the number as the first character. In other words, it has a higher potential for error, so it's not recommended. That being said, it IS acceptable to use a number AFTER the first character. By the way, a domain name (like 4chan.org) is a little different because it's not a file.
Here are some more tips/best practices (you'll see it as #3):
I think you need to go back to this someone and ask them for more information - are they saying there's a security problem? a usability problem because of something users might want to do with it? a Search Engine Optimisation trick you're missing that would make it easier for people to find?
I can't actually think of why numbers in URLs would matter for any of these, however. It seems most likely they were thinking of SEO, because that's a constant battle between search engines (who want users to get the results they want) and publishers (who want to get their brand higher up the results) and full of half-understood experiments and dodgy advice.
It's also worth noting that URLs don't exactly have "filenames" at all - they're just a string that the browser sends to the server, and the server may or may not map to a file on disk. Look at the URL of this page, for instance - it contains enough information for the server to look up the right question in a database, plus some human-readable text which is mostly for SEO.
Your server has filenames, of course, but I can't think of any reason why having numbers in those would be a problem, let alone why it would apply particularly to web pages.
Edit based on additional information supplied:
Two things I notice about the link you've added: one, it's twenty years old; two, it includes detailed reasoning for every single point, except point 3. I can't think of any "programming languages and operating systems" that would have a problem with a leading digit. It's actually quite common in some (non-web) contexts, as a way of forcing files to be listed or run in the desired order (e.g. 01-contents.txt, 02-introduction.txt, etc).
I can imagine problems if you began the filename with a ., -, or _, because sometimes there are entrenched conventions that those are hidden, or backups, etc. Either the advice made sense 20 years ago, or the author was being overly conservative to keep the rule simple.