IMPORTANT IMAGE SIZES TO REMEMBER:
Cover image: 3000px x 1080px (w x h) and less than 2 mb.
Community stream images: No larger than 1500 x 1000px Max file size: 2MB.
Classified product images: No larger than 650kb, for faster loading.
If you want to add emphasis to your copy you can add Markdown with simple code:
Bold text: Add 2 asterisks before and after the word/phrase: **sample** for sample
Italic text: simply add 1 asterisk before and after the word/phrase: *sample* for sample