I need a cite were I can get free OS latest software?

Cite with a C is a verb. You want a site with an s.

OS is Operating System such as Windows or Linux. There are some free, but they are not what you want.

The first place to look for all your software needs is tucows.com and the second is download.com/ They usually have the same programs, but not always. I put tucows first because I like their downloader better, but you still have to pay attention and decline the adware.

The free photo editor is Gimp from www.gimp.org/downloads/ I know nothing about tutorials, but you can use google.com to find some.