Yosemite has some great features for browsing and making calls. They can be disabled if they get in your way.
In Safari, click View > Show All Tabs. This will show all the tabs open on all your devices, provided they are all signed into iCloud with the same user name as your Mac. You can close tabs on your iPhone from your Mac by placing the pointer over an iCloud tab’s name and then clicking the cross that appears to the right.
OS X has a darker display option for the menu and Dock, which can be more restful for working in low light. You can enable this in General Preferences. If you switch back and forth often, you can enable the ≈+å+ç+t shortcut by typing defaults write -g _HIEnableThemeSwitchHotKey 1 in Terminal, then logging out and in again.
If you don’t want to receive incoming phone calls from your iPhone on your Mac, open FaceTime’s preferences and clear the box marked iPhone Cellular Calls.
To stop text messages from being forwarded to your Mac, open Settings > Messages on your iPhone and tap Text Message Forwarding, then turn off the switch next to your Mac’s name.
Safari lists frequently visited web pages, based on your browsing history, when you click its address bar. You can drag any of these pages out of the panel to remove them from the list.
Safari automatically provides shortcuts to pages you visit often. They can be removed individually.