What can you negotiate besides compensation?

Can you negotiate benefits / perks or are these generally standard and immutable?
If yes, should this negotiation start once the compensation negotiation is done, or at the same time?

Thinking about:

• PTO / Holidays / Sick days
• Remote work days
• Transportation perks
• Learning perks (books, online courses etc..)
• Discounts in your company proucts
• Healthcare subscriptions
• Sports perks