I used to create pixel art in Aspire and now am trying to use Photoshop. When I use the 1px pen tool, the 1px brush and 1px grid do not align properly. What is going on?
The problem is your grid settings.
cmd+k on mac) to open the Preferences window and enter Guides, Grid & Slices.
Under Grid make sure to set the unit to Pixels and make sure that Gridline Every equals Subdivisions. For example you could set both to 10:
Alternatively, if you have GPU rendering enabled, there is a built-in 1px grid available. Toggle it with View > Show > Pixel Grid.