Repeating the same keyword in many ALT of images is against Google Terms?
Forexample i have a Games site, and there are 2 categories 1. Arcade Games 2. Shooting Games and my Targeted Keyword is "Online Games" so if i write ALT for Arcade Games as "Online Games - Arcade" and Shooting Games as "Online Games - Shooting" and i have over 40 categories, so is it good for ranking to use the same keyword in the 40 categories?
Alt tags are there to help human visitors who for one reason or another do not see the images. Instead they get an alternative text. And that text should be precise and relevant.
> Repeating the same keyword in many ALT of images is against Google Terms?
No. If your page has 20 images of widgets in 20 different colours it will be quite alright to give them alt texts like "Blue widget", "Light green widget", "Pink widget" etc. but you should not expect to gain any significant advantage in search engines.
And if your website for one reason or another gets a visit by a person from a search engine and your alt tags look spammy you should not be surprised if you are hit by a penalty.
From a search engine perspective you are wasting your time
I have to respectfully disagree. A picture is worth 1000 words, unles it's to a search robot. Why not make it worth 10 or 12? Don't make it spammy. It adds to the overall "useability" of the site by telling certian users (the blind, people with diminished sight, and people who's computer errors out the image) what product pictured. Useability tends to equal good SERP positioning.