What is a train? +Newbie Question about "value"

• Can i see if a game gets full, reduced or no value?

A train is basically a group of GA's made to link one into another. So you can , maybe, 4 GA's and link one into the first, another into the second and so forth,.

Reduced value have * next to it, when you create a giveaway and no value have **.

It means the game has been in whatever bundle in the past *

and been free **.
You can check bundle games here: https://www.steamgifts.com/bundle-games
And your CV here: https://www.sgtools.info/sent/timmyfromspace/newestfirst

Edit: I can't get it good with the format to write those ** in my comment >_<
Edit2: finally ^^'

Thanks for your help!

Regarding the no value and reduced value, the FAQ states in part:

When creating a giveaway and selecting a game, you'll notice "No Value" games are marked with a double asterisk (**), and "Reduced Value" games with a single asterisk (*). If you hover over those icons, you'll see the effective date for the value adjustments. For example, if a game is marked with a single asterisk (*), and hovering the icon shows "Reduced value since January 4, 2018", this would mean giveaways created for that game on January 4, 2018 or later will receive reduced contributor value. Games typically receive no value or reduced value when they're featured in bundles, heavily discounted, or available for free in online promotions. 

It sounded like a closed, invite only (+level if you like) chain of give-aways?

Exactly, you include the link to the next entry in the description of the first giveaway, and so on. They are made for a variety of reasons--sometimes for fun, sometimes because you want to link a series of games together, sometimes because you wish to avoid bots that don't read discussions, or even just because you can and feel like making it.

If you prefer you can do a chart instead of a train.
Example: https://www.steamgifts.com/discussion/TjjwR/chart-cleaning-up-lvl0-3

Use this to help you with the format: https://www.steamgifts.com/about/comment-formatting

This guy went right through to my whitelist :D

I white listed you. I appreciate the high quality games you have given out.

The abuse is mainly bots autojoining the giveaways. If you notice giveaways that are Lv 1 or no level have thousands of entries within a few hours.