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Allrounder Mastery is available to all heroes and does roughly the same for all heroes.
Upon learning Allrounder Mastery you will instantly receive 2 free Talent points and a bonus to maximum energy. The maximum energy varies depending on hero. Predator and Anvil will receive only +105 maximum energy and Tassadar +135. All other heroes are somewhere in between.
Learning the Mastery will start a timer which will grant you an additional talent point every 45 minutes. You can receive unlimited bonus talent points, but game progression and talent pool will cap you out at some point. If you gain additional talent points, but can not spend them all, the bonus talent points will be discarded.
it sucks.
[Extra info]
Even if you take this mastery first it won't give you much. Basic math: 2 talents at start, 1 each 45 minutes would result in total of 6 extra talent points for 3-hour-game. At current stage don't waste your mastery point and use it for something more useful.