Keyboard buttons not working properly

@rahulkumar59668 could be a bad keycap. I would ry and replace those first. It'll come off similar to the one shown here If that does not work, then you may have a bad keyboard. Bad news is that your keyboard is considered part of the top case. That means you will have to completely disassemble your laptop to replace that. Use the HP 15q Ds0000 Maintenance And Service Guide HP 15q-ds0000 Maintenance and Service Guide.

Now, the keyboard is attached to the top case by lot of plastic "rivets" you can always try and either carefully drill them out or use a soldering iron with a sacrificial tip and melt those off. Then get a replacement keyboard and attach that with some small screws. You will have to make sure that it sits tight and snug on your upper case. It is possible but takes a lot of work.