Need help making an even slope. I'm new I'm looking to take the 4 vertices circled in red and raise them along the Z axis to create a slope with the same X axis coordinates as the slope with the green line such that all 5 faces create one smooth plane. I've been messing around trying to figure it out myself and I've tried searching for a solution but I couldn't find anything, or at least nothing that I could understand
With Pivot Center set to 'Active'..


in Edit>Face mode, select the face you want to flatten to
hit CtrlAltSpace to create a Custom Transform Orientation from the face. (Check 'Use After Creation' and, if you don't want your custom orientations to hang around in a list: 'Overwrite Previous')
in Edit>Edge mode, select the edge-loop around the hole
in Edit>Vertex mode (the hole edge-loop should still be selected, as vertices), also make one of the vertices on the orientation-face active, by Shift-selecting it last.
hit SZZ0, to scale the all your selected vertices to 0 along the normal (the local Z-axis) of the face defining your custom orientation, centered on the active vertex.