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In 2009 I bought PhotoShop from an Internet e-shop. At that time I was in Greece. Then I learned that if someone brings PS from the US, or buys from the internet is not legal and he is going to pay a penalty. One PhotoGrapher had bought PS from America, when they found him he paid a lot. This is very bad you buy, you pay a penalty and you can not use it (PS). So I decided to learn an alternative software and this is GIMP.
As you know that a FREE alternative to PhotoShop is Gimp and Save For Web is a plugin of GIMP. Gimp has many plugins, Themes, and other staff. A way to optimize an image in order for our site to be fast is to install the Save For Web Plugin and use it. This Lessons of Udemy offers all FREE.
Site of Gimp
See out PATH for GIMP
In this PATH has the Tutorial about Save For WEB
--- video lessons
--- the famous plugin Save For Web + Gimp version that works (and other plugins), this plugin can be used to optimize images for Web
--- a book about GIMP.