If you need commands quickly, you can use the 'Run' Box to type them in. Instead of searching them all over Windows.
Shortcut for the box is: Windows Key + 'R'
Here is a list of useful commands:
Add/Remove Programs = appwiz.cpl

Computer Management = compmgmt.msc

Defragment User Interface = dfrgui

Device Manager = devmgmt.msc

Direct X Diagnostic tool = dxdiag

Disk Cleanup Utility = cleanmgr

Disk Management = diskmgmt.msc

Event viewer = eventvwr.msc

Group Policy editor = gpedit.msc

Licensing diagnostics = slmgr

Network Connections = control netconnections

Network Connections = ncpa.cpl

Regional Settings = intl.cpl

Registry Editor = regedit.exe

Remote Desktop = mstsc

Services = services.msc

Shared folders and open sessions = fsmgmt.msc

System Configuration = msconfig.exe

System Information = msinfo32

System Properties = sysdm.cpl or Windows key + Pause/Break

System Restore = rstrui.exe