Connecting to internet

I have a MacBook Pro and recently I have a problem connecting to the internet each time I start the computer. I know the internet is working in my house because I can connect other devices to it. After starting the computer the bar showing that it is connecting to the internet only moves a little bit and just stops.

The only solution I have found is to restart the computer and on the second try it connects but the connection may not last long.

Is there any changes I can make on the computer so it connects to the internet the first ty as it should? I rely on my kids but now there off to college. Any help would be greatly appreciated.

Thank you.