400 Bad Request Error

I have been unable to work out why but I have 400 Bad Request Errors whenever I try to use links in my (barely started) blog. I gave up adding pages to it, thinking that the issues surrounded the location of my SQL db but when I check the MySQL app within my cPanel everything apparently checks out fine.

I have copied one link which produces a 400 error:

If anyone has any ideas I’d be very grateful for any advice.