New here, iphone photo tips

[Mjonesminn]

Hi All, I am new here and to online forums in the first place, also not sure if this is the place to post this and I tried searching, but here it goes... Nearly every photo I see here is large and really high quality - I have posted a few photos so far but due to size restrictions they look small and blurry after I save and resize them on my iphone in order to upload. Should I be doing something differently to be able to post higher res photos from my iphone? I realize you all are not my personal IT department but any suggestions would be awesome!