With regard to email services, I'm a happy Protonmail user. I recommend it to everybody. It's free and it allegedly stores only encrypted data on the servers.

I try also to avoid spreading too much information while browsing by using some Firefox Add-ons like Noscript (set to block Google Analytics and others by default) and Cookie Autodestruct to allow persistent cookies only on Personal and Work tab containers.

Mozilla is doing a pretty good job with privacy issues.