In Photoshop CC 2017 you use the Search feature to quickly find tools, menus, tutorials, tips, assets, documents, layers and more.
To bring up the Photoshop Search box press Ctrl F (Mac: Command F). Then type a keyword in the search box.
You will then get results under three categories. The Photoshop category are items that you could find through the Photoshop interface; such as tools, layers, and panels. Results in the Learn category are documentation or instructional material from helpx.adobe.com. Results in the Stock category are assets from the Adobe Stock library.
Note: In previous versions of Photoshop, Ctrl F (Mac: Command F) was the keyboard shortcut for reapplying the last-used filter. To reapply the last used filter in Photoshop CC 2017 press Ctrl Alt F (Mac: Command Option F).