Alien Registration Number or A number found on EAD (OPT, H4 L2 etc) card, Green Card, Immigrant Visa or i140 approval i797c form. USCIS number = A number.#green card
You can travel while H1B is pending with USCIS. H1B Change of Status is abandoned. Transfer, Amendment travel allowed. For re-entry, you need valid H1B.#H1B work visa
USCIS NTA policy allows 18 - 33 days grace period to file appeal or leave USA before NTA is issued. H4 child can get NTA. I140, H1B extension 240 day not in NTA.
USCIS status - Name was updated can happen due to internal name correction to match your paper application. Address change update could be to fix apartment or street number.
Car insurance basics for h1b visa. Only Liability insurance is mandatory at state minimum values. Save money on montly premium by not buying optional cover.