How do cells get the energy that they need?

They have parts of the cell that feed them when for example a plant is in the sunlight it creates food of its own its called photosynthesis it uses glucose to create its food and oxegen.

Cells get energy in the form of food molecules if they are animal cells or sunlight if they are plant cells. The process used by all cells to create usable energy is quite similar, no matter the source of the energy.