How to clear our your inbox

Hi guys my inbox is full and I been trying to clear it out but I don’t want to spend all day deleting messages or selecting thousands of messages and deleting them.

Is there an easier way to get rid of this in a much quicker and effective way.

What e-mail application are you using? Or, if it's in a web browser, what e-mail system is it (gmail, hotmail, etc.)?
Do you want to delete all messages from your Inbox? If I wanted to do that I'd just right-click Delete All, and then go and grab a coffee whilst it did it thing. Do you not have a similar option? Or is that too slow?
If you don't want to delete everything, but just get rid of the largest e-mails, can you not do a "sort by size", or similar, and them remove the largest e-mails?
Don't forget that many e-mail systems don't actually delete e-mails, they simply move them to a "deleted" folder (or similar). You'd then need to empty that folder to reclaim the space.

I use a gmail account I think I just need to get rid of everything in general as there is just constant spam which I don’t need. I just want emails coming in that are important. And not just a bunch crap coming through and just tired of having to unsubscribe from each one.

Then it sounds like you need How To Delete All Emails On Gmail Web And Mobile (just scroll down to the "How to Delete All Emails on Gmail at Once on the Web" heading and ignore the adds for a tool which claims to help.)