The triggered ability will trigger whenever any land with the subtype Forest enters under your control, not just one named Forest.

If Reach of Branches leaves your graveyard before its triggered ability resolves, the ability will have no effect, even if the card returns to your graveyard before then.

While it appears only on cards that already have other card types, kindred is a card type and will be counted by effects that refer to the number of card types among cards in a zone.

Kindred is a card type that allows noncreature cards to have creature types. For example, Echoes of Eternity is an Eldrazi (although not a creature) while on the battlefield and an Eldrazi card (although not a creature card) in zones other than the battlefield.

This cards was originally printed with the "tribal" card type. That card type has been replaced with "kindred". This change does not affect the gameplay function of this card.