Ory is the largest open source community in the world for cloud software application security. We maintain advanced open source security software solving authentication, authorization, access control, application network security, and delegation. Ory implements a variety of industry and best-practice standards including OAuth 2.0 / OAuth 2.1, OpenID Connect, Zero Trust Networking, Google Zanzibar Policy Framework, FIDO2 U2F, WebAuthn, TOTP, and more.

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Hi guys, I've started integrating Ory and moving away from Auth0 and I have some questions.
I'm kinda confused about Ory Proxy / Ory Tunnel, and how to setup my project. I mainly tried to follow this <https://www.ory.sh/docs/getting-started/integrate-auth/react|React.js guide>.

I have a react app (SPA) that is served on 5173. My express.js server is served at 3000. I've successfully managed to start Ory Kratos, Ory Kratos UI (self-serve) and have managed to do a simple login in the ory ui.

Now, I'd like to connect it to my app. According to my understanding, I have to run Ory Proxy in order to avoid CORS issues. However, I'm not sure sure about these subjects:
• I need to specify a project slug. What is that? If I only need to run it locally, what do I need to do?
• I tried to specify the playground project, just to make it work. However, when my React app tries to send a request to "<http://localhost:4000/sessions/whoami>", it gets a 304 response. 
• In general, who do I need to use? ory proxy or ory tunnel? I'm not sure