What shall one do after receiving a green card?

Here is what I am aware of.

Actions to take ASAP:

• Replace/update your SSN card. This can be done at your local social security center. See https://www.ssa.gov/
• If employed: ask the employer to update the I-9
• If you have some accounts at banks, insurance, mortgage: inform them about your residency status, as in some places you may be eligible for lower rate after getting the green card.
• If you are a male between ages 18 and 26: Register with the Selective Service (U.S. Armed Forces)

Things to do until you get US citizenship:

• Fill an form AR-11 (Alien's Change of Address Card: https://www.uscis.gov/ar-11) each time one moves
• Carry proof of your permanent resident status at all times.
• Keep track of some information to be prepared to apply for naturalization in five years
• If you plan to remain outside of the U. S. for six months or longer, you are strongly suggested to obtain a 'Re-entry Permit" before leaving the U.S.

Did I miss something?