The following is a list of do’s and don’ts associated with Old Glory, the U.S. Flag.

When displaying the flag, DO the following:

• Display the U.S. flag from sunrise to sunset on buildings and stationary flagstaffs in the open. When a patriotic effect is desired the flag may be displayed 24-hours a day if properly illuminated during the hours of darkness.
• When placed on a single staff or lanyard, place the U.S. Flag above all other flags.
• When flags are displayed in a row, the U.S. flag goes to the observer’s left. Flags of other nations are flown at same height. State and local flags are traditionally flown lower.
• When used during a marching ceremony or parade with other flags, the U.S. Flag will be to the observer’s left.
• On special days, the flag may be flown at half-staff. On Memorial Day it is flown at half-staff until noon and then raised.
• When flown at half-staff, should be first hoisted to the peak for an instant and then lowered to the half-staff position. The flag should be again raised to the peak before it is lowered for the day. By “half-staff” is meant lowering the flag to one-half the distance between the top and bottom of the staff.
• When the flag is displayed over the middle of the street, it should be suspended vertically with the union (blue field of stars) to the north in an east and west street or to the east in a north and south street.
• When placed on a Podium the flag should be placed on the speaker’s right or the staging area. Other flags should be placed to the left.
• When displayed either horizontally or vertically against a wall (or other flat surface), the union (blue field of stars) should be uppermost and to the flag’s own right, that is, to the observer’s left.
• When displayed in a window it should be displayed in the same way — with the union or blue field to the left of the observer in the street.
• When the flag is displayed on a car, the staff shall be fixed firmly to the chassis or clamped to the right fender.
• When the flag is used to cover a casket, it should be so placed that the union is at the head and over the left shoulder. The flag should not be lowered into the grave or allowed to touch the ground.

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Source: military.com