Short answer: if Android does not have enough room to install a new app, start by clearing the heaviest and lowest-value storage categories first. Large files, downloads, screenshots, and stale app media usually create faster room than deleting apps blindly.
This is a situational cleanup job. The goal is not to reorganize the whole phone. The goal is to create enough free space quickly so the install succeeds, while avoiding the frustration of deleting something important only to realize the phone was still blocked by heavy files elsewhere.
What to clear first
Large videos, exported clips, and other heavy files.
Downloads, documents, and offline files you do not need anymore.
Screenshots and saved low-value images.
Chat app media and repeated files if the quick wins were not enough.
Why app deletion is not always the first move
The app you want to install may only need a modest amount of free space.
A few heavy files can create enough room faster than uninstalling something you still use.
App deletion can remove useful setup, sign-ins, or offline content you actually wanted to keep.
When to widen the cleanup
If the install still fails after the obvious heavy categories are handled, the phone probably has a broader storage problem. That is the point where you move from urgent install cleanup into a full Android storage pass.
If you want that broader route, open free up Android space. If you need the diagnosis view first, continue to What Is Taking Up Space on My Android Phone?.
When Android blocks a new install, the fastest fix is usually removing storage weight, not sacrificing useful apps first.