Wifi problems! secured, no internet!!!

Hi guys!
Please I need some help! Okay so I have a Dell Inspiron 15 series 5000 laptop.
Today morning I woke up with my laptop showing wifi connected "no internet, secured"
Idk what this means. I can't use Firefox or chrome and I'm dying I need internet right now!!
I checked network status and its showing "no internet access"
So I clicked "troubleshoot" and then it showed your wifi doesn't have a valid IP configuration, but idk what's this supposed to mean, my iPad, my dad's laptop etc everything is working fine, but what's wrong with mine?
I checked it again this time when I pressed troubleshoot it said it couldn't identify the problem!
Help me!! What can I do! There are many solutions all over Google but I'm afraid which one to try out and what if I make a wrong decision. So please tell me guys what can I do, please explain in easy words I'm just 9th grader who is horrible in this IT stuff, please help me.