Some (IMHO) very relevant past conversations on HN about equity:

1) Introducing Progressive Equity – Increase employee ownership as company grows: https://news.ycombinator.com/item?id=9336392

2) What I Wish I'd Known About Equity Before Joining a Unicorn: https://news.ycombinator.com/item?id=13426494

3) Open Guide to Equity Compensation : https://news.ycombinator.com/item?id=10880726

4) Employee Equity (Sam Altman) : https://news.ycombinator.com/item?id=7610527

5) Guide to Your Equity: https://news.ycombinator.com/item?id=10362141

6) Holloway Guide to Equity Compensation: https://news.ycombinator.com/item?id=17717727