Phases of the Dota 2 game
Laning Phase & Early Game
The laning phase is the period when the majority of heroes on the map want to acquire farm or experience in relatively static positions.The early game is the period where the tempo favors heroes that rely little on either XP or gold, while heroes that are heavily reliant on either resource will be weaker.
In both cases, supports and some junglers are vastly more likely to move around the map in order to disrupt, gank, or defend other lanes. Depending on the mid, they may or may not make rotations as well.
The laning phase ends when one team moves most of their team around the map and begins teamfighting, split pushing, or pushing hard with a push lineup.
The early game usually ends after about 15 mins. Heroes that need to pick up fast efficient items or greedy items will have farmed them up. Heroes that come online early will have reached at least a core item.