I will make an example for you to understand:

1) Create any folder for versioning;

2) inside this folder, start Git :

git init

Initialized empty Git repository in [caminho da pasta]/.git /

3) Create a file in word and save in this folder:

4) See the git status :

git status

On branch master

No commits yet

Untracked files: (use " git add ..."to include in what will be committed)

   documento-word-2013.docx
   ~$cumento-word-2013.docx

Nothing added to commit but untracked files present (use "git add" to track)

5) make the first commit :

git add .
git commit -m "Documento criado"

6) make a change to the Word file and save:

7) make the second commit :

git add .
git commit -m "Adicionado segundo texto lorem"

8) See list of commits :

git log

Commit 97ccced5fc1f03bf8a4c1747be6915039f384c9c (HEAD - > master)

Author: lipespry

Date: Thu Jan 10 04:59:49 2019 -0200

Adicionado segundo texto lorem

Commit 2e5e1914988c4aab4d83e57aa0b59254da4fbe18

Author: lipespry

Date: Thu Jan 10 04:58:12 2019 -0200

Documento criado

9) back to first snapshot :

git checkout 2e5e1914988c4aab4d83e57aa0b59254da4fbe18

Note :checking out '2e5e1914988c4aab4d83e57aa0b59254da4fbe18'.

You are in' detached HEAD ' state. You can look around, make experimental changes and commit them, and you can discard any commits you make in this state without impacting any branches by performing another checkout.

If you want to create a new branch to retain commits you create, you may do so (now or later) by using-b with the checkout command again. Example:

git checkout -b <new-branch-name>

HEAD is now at 2e5e191 document created

10) open the file and check how it is:

@edit (thanks to Jefferson Quesado):

It's a shame, but Git doesn't detail changes to Word documents (git diff). At least not natively.