If you just got laid off and you can read this, you're already doing the right thing, moving information into action. Here's what to handle in the next 48 hours, in priority order:
Hour 0-2 (BEFORE you accept any docs): Don't sign anything in the meeting itself. "I'd like time to review with my attorney" is a complete and acceptable sentence. Take a photo of any presented severance / separation document. Note what was said about: severance amount, benefits continuation, accelerated equity vesting, mutual non-disparagement, references policy.
Hour 2-8: Forward all important personal docs (W2s, paystubs, performance reviews, code/IP you might want to demonstrate later) from your work email to personal. You will lose access fast. Download a copy of your LinkedIn data (Settings → Data Privacy → Get a copy of your data) in case account-recovery issues hit. Apply for unemployment THE SAME DAY. Most states pay back to your application date, not your termination date. Every day you delay is money on the table.
Hour 8-48: Have one: ONE: person review the severance document before you sign. Local employment lawyer ($300-500 for a 30-min review) is usually money well spent on packages over $50K. Don't post on LinkedIn yet. Process first. The "open to work" post can wait 5-7 days. Triage healthcare: COBRA decision deadline is 60 days but the gap creates a documented coverage hole; ACA marketplace special enrollment is 60 days from job loss.
The next 6 months are easier to navigate if you protect your leverage in the first 48 hours.