Half Life 2 is Free on Steam
(store.steampowered.com)
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Mods, and a fan video (there was a time were steam were seeming to look into hosting movies videos, you can find some of that on the store as a legacy stuff i guess).
There is only the orginal half life series
Which started with the Half life, then come the stand alone expansions Blue Shift and Opposing Force and then Half life 2 with it's stand alone expansions Episode one and two.
You got a remake of Half life called Black Mesa not made by valve.
You can play Half life 2 without knowing the first one, although some refs will go missed, but nothing of grand importance.