Use winmerge in git bash

 .gitconfig

location

•  C:\Users\<name>\.gitconfig

.gitconfig

[diff]
       tool = winmerge
       prompt = false
[difftool "winmerge"]
       path = C:/Program Files/WinMerge/winmergeu.exe
	   cmd = \"C:/Program Files/WinMerge/winmergeu.exe\" /e /u /wl /dl "$LOCAL" /dr "$REMOTE" "$LOCAL" "$REMOTE"
[merge]
       tool = winmerge
       prompt = false
[mergetool "winmerge"]
       path = C:/Program Files/WinMerge/winmergeu.exe
       cmd = \"C:/Program Files/WinMerge/winmergeu.exe\" /e /u /wl /dl "$LOCAL" /dr "$REMOTE" "$LOCAL" "$REMOTE" -o "$MERGED"
       trustExitCode = true
       keepBackup = false

[diff]
       tool = meld
       prompt = false
[difftool "meld"]
       path = C:/Program Files (x86)/Meld/Meld.exe
	   cmd = \"C:/Program Files (x86)/Meld/Meld.exe\" "$LOCAL" "$MERGED" "$REMOTE" --output "$MERGED"
[merge]
       tool = meld
       prompt = false
[mergetool "meld"]
       path = C:/Program Files (x86)/Meld/Meld.exe
       cmd = \"C:/Program Files (x86)/Meld/Meld.exe\" "$LOCAL" "$MERGED" "$REMOTE" --output "$MERGED"
       trustExitCode = true
       keepBackup = false
[user]
	email = sflee1112@gmail.com
	name = SulfredLee