SEC is dividend yield. YTD is return. For stocks those are two completely different things.
I would suggest going to getting started in the Wiki https://www.bogleheads.org/wiki/Main_Page and also reading start to finish in some basic books on investing including Bogleheads, Swedroe, Ferri, Bernstein, etc. etc. to learn basic definitions and facts about investments. You can also glean a lot of information about these things by spending time reading a lot on the forum.