Look over your pre-cut adhesive strips and figure out what they are used for.

Here are some common adhesives used in a phone repair, and examples of what they may look like:

Screen or back cover adhesives—usually the shape of the device

Back cover support adhesives—these will match the contours of components pressed against the back cover

Battery adhesives—normally a rectangular perimeter roughly the shape of the phone's battery

Component adhesives—they will be contoured to match the various components such as cameras and fingerprint sensors they are designed for

You usually want to apply the screen or back cover adhesives last. Be sure to apply all component adhesives beforehand, and if possible, test your repair before sealing up the device.