Changed Battery and now it the power button doesn’t work

I’m a bit panicked, this was my first time doing a repair by myself and I followed the instructions on this site what I would like to think was perfectly. I replaced the battery and now the charger isn’t lighting up to signify it’s charging but also when I hit the power button the screen doesn’t even light up to say that the laptop needs to be charged or is charging. If there’s anything I might have done wrong or should check for please let me know? I need all the help I can get!