Welcome to /p/hotography. AKA "pee"Edit
• We prefer JPG format, compressed to around 1MB or less.
But if you just resize to about 1000 pixels on the tall edge it's large enough to appreciate, and regardless of compression/quality settings will usually bring the filesize to around 1MB.
Appropriately compress AND resize your images if you want more people to look, and less to complain.
'The Wikia' is a loose collection of notes & links, but it contains a lot of typical questions and answers.
Use ctrl-F to search, and expand the contents menu at top for an index.
• We come here for photos, so post your own as often as possible, even if "image unrelated" to your text.
It is usually counter-productive to post external site links unless you also post some images as incentive to visit it.
• Expect to be judged harshly.