In response to the large scale invasion by Hamas, Israel started a total blockade of the Gaza Strip. In announcing the blockade, Israeli Defense Minister Yoav Gallant said that a "full siege" had been ordered and stated:

No power, no food, no gas, everything is closed. We are fighting human animals and we act accordingly.

Israel has subjected the Gaza Strip to varying levels of blockade since Hamas rose to power in 2007.

Map of Gaza Crossings, 2020 BBC/UN Ocha

Additional information can be found via the United Nations Office for the Coordination of Humanitarian Affairs, which tracks a number of statistics indicating the humanitarian conditions in the Gaza Strip.