# git rebase main topic
$ git checkout topic
$ git rebase main
%%{init: { 'logLevel': 'debug', 'theme': 'neutral', 'gitGraph': {'rotateCommitLabel': false}, 'themeVariables': { 'commitLabelFontSize': '14px' } } }%% gitGraph LR: commit id: "C1" commit id: "C2" branch "old topic" order: 3 commit id: "C3" commit id: "C4" tag: "ORIG_HEAD" checkout main commit id: "C5" commit id: "C6" branch "topic" commit id: "C3′" commit id: "C4′" tag: "HEAD"