Learn Spanish (Latin America): La computadora se hizo indispensable para el proyecto. - The computer became indispensable for the project.

We use hacerse for changes that are seen as gradual, active, or related to a new role or function. When the computer took on this essential role through ongoing use, se hizo captures that evolution. Se volvió is generally used for more sudden, profound, or involuntary changes in nature or personality.

What happens if I forget the se and just say La computadora hizo...?

The sentence changes meaning completely. Without the reflexive pronoun se, the verb hacer just means "to make" or "to do." You would be saying "The computer made indispensable..." and the listener would expect you to add the thing that the computer affected. Adding se changes the verb to "became" (literally "made itself").

Why do we use para instead of por in para el proyecto?

We use para here because it marks purpose or destination. The computer is indispensable for the goal or benefit of the project. If you used por, it would mean the computer became indispensable because of the project, which shifts the focus to the cause rather than the goal.

Does the adjective indispensable need to change to match the feminine noun computadora?