[micampe]

git checkout -b bugFix creates the branch and puts you on that branch, git branch bugFix creates the branch and leaves you where you are, so in your first example you are committing on the branch and then merging to master, in the second example you are always committing to master.

try it in the website and you’ll see that in the second case bugFix never changes. the merge will say nothing needs to be done because bugFix already contains all changesets in master.