Exercice VBA EXCEL

Bonjour,
J'aimerai savoir la signification de ces codes en vba svp :

Code:

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var = Worksheets("Feuil1").Cells(65536, 3).End(xlUp).Row

Code:

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Worksheets(“feuil1”).Range("A" & i & ":H" & i).Font.Color = RGB(255, 0, 0)

Code:

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Dim Projets_plr() As String
Dim x, y, z, nbline_projets_plr As Integer
Flag_trouve = False
x = 15
y = 0
nbline_projets_plr = ThisWorkbook.Worksheets("Configurateur").Cells(65536, 3).End(xlUp).Row
 
While x <= nbline_projets_plr
    If ThisWorkbook.Worksheets("Configurateur").Cells(x, 3) <> "" Then
        ReDim Preserve Projets_plr(0 To y)
        Projets_plr(y) =    ThisWorkbook.Worksheets("Configurateur").Cells(x, 3)
        y = y + 1
    End If
    x = x + 1
Wend

Merci beaucoup !