I was a commercial lawyer for eleven years. I now sell contract templates. None of this is advice for your situation and you should pay someone for that. But these five come up so often that I would rather write them once.
- Limitation of liability with no cap. If your contract does not cap what you can owe, the cap is "everything you have".
- "Lifetime" with no definition. Lifetime of what? The customer, the product, the company? Define it. See the Lifetime Deal War for why.
- Auto-renewal with no notice. In several countries this is unenforceable against consumers and you will refund the whole year.
- Contractor agreements that do not assign the code to you. By default, in many places, the contractor owns what they wrote.
- Terms copied from a company fifty times your size. Their terms promise things you cannot do, like a 99.99% uptime commitment.
Ask questions below and I will answer the general ones.