MAC Wi-Fi PROBLEMS, NO IP + NO INTERNET CONNECTION?

This has been a frustrating week, I've watched many videos and read and done so many posts on how to fix this but I can't. It says it's connected but the Wi-Fi signal bar has an exclamation mark on it which doesn't allow me to go on the internet.
I've restarted my computer, deleted my ip address + Wi-Fi password, unplugged the router so much.
3 other devices in my house aren't working too? But I don't think it's the routers fault because I also connected my iPhones Wi-Fi to my mac to have it say no internet connection.
Someone needs to help me and/or direct me to a post that'll help, please!

Okay. If this doesn't work you should seriously consider contacting your internet service and make them come over and fix it. Try resetting your router, there's a little hole where it should say Reset on the bottom, just put like the tip of a pen in there with a LITTLE force. If your router is old, you might also want to consider getting a new one. Check if everything is plugged in as well, that is a common situation.

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