I am working on this animation and just realized that around maybe 2 thousand objects are messed up with sequence of animation so how do I select all those objects? Kinda like Photoshop selection tool
Selection Brush: You could use the selection brush of Blender with the C shortcut. To select use the Left mouse button and to deselect use the middle mouse button. Use the mouse wheel to increase the size of the cursor. Press Enter or Esc to confirm the selection
Lasso Selection Tool: Hold down Ctrl and click and drag over your items. Let go of Left mouse button to confrim the selection
Also you could do like the user m.ardito said using the Shift key to select mulptiple objects. Also if it's easier select all objects with A and deselect the objects you don't need to affect. Otherwise you could select of the of the right objects and invert your selection with Ctrl + I.