We are given this url and not much else.
This takes us over to an interesting site.
Everything looks fairly normal, so just like the first step in any CTF. CTRL+U !
As we can see here its telling us to look at the SEO text. This is a pretty big hint to check the crawler rules over at a sites /robot.txt
From here this is fairly obvious. The flag must be located at /fl4g.
And it is.