Android - How can I easily share links or text between my Android phone and my laptop?

Forget the pain of emailing stuff just to share some text. If you are running Android version 4.0 & above, check Keep from Google.

Keep works on your phone, tablet and computer. Everything you add syncs across all of your devices.

Visit https://keep.google.com/ to open Keep on PC.

Add your notes/text/link/audio note/photo. Immediately this would be synced across your devices. You can access the same stuff in your android app.

Works vice versa as well.

Get Google Keep Android app from here.

Click here to watch Google Keep video tutorial.

Some time after asking this question I found the Pushbullet app, which shares clipboard items across devices. Since Pushbullet changed its business model, I moved on to using the Join app which has similar features to Pushbullet and, although not as polished as Pushbullet, is functional and meets my original requirements.

Update (Feb 2021): And some time again after finding Pushbullet, the service made a radical change to pricing, so I chose to find an alternative. I've been using Join (https://joaoapps.com/join/). It's not as polished as Pushbullet and it doesn't work in Firefox, but it still meets my needs and it's a one-time purchase. It also has some power user features that might appeal to SE users.

For your specific example, just use Whatsapp on your laptop's browser: https://web.whatsapp.com/