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+------------------------------------------------------------
+Git Basics (commit, diff, branches):
+------------------------------------------------------------
+
+1(A) touch abc.txt
+     echo 1 > abc.txt
+2(A) The color is Red
+3(A) git add abc.txt
+	 The color is now green (after adding to index)
+4(A) echo 2 >> abc.txt
+5(A) The color is now Blue
+6(A) git diff HEAD
+7(A) There is nothing to print because the command above shows the changes between “Index” and “HEAD” and there is
+     nothing on Index (we only changed the working copy.
+8(A) Invalid command (ambigous argument)
+9(A) git add abc.txt
+10(A) There is nothing to print because the command above shows the changes between “Index” and “Working copy” and
+      right now they are identical.
+11(A) git diff --staged
+12(A) echo 3 >> abc.txt
+13(A) No, since “main”, “index” and ”working copy” are have different changes, the output is different.
+14(A) abc.txt appears twice because we have one copy of abc.txt in index ready to commit and another modified abc.txt
+      in working copy.
+15(A) git reset --hard
+
+------------------------------------------------------------
+Resolve conflicts:
+------------------------------------------------------------
+
+1(A) git branch
+2(A) git checkout -b feature/lambda_migration
+3(A) git merge feature/version1
+4(A) done as described on Pycharm UI
+5(A) done as described on Pycharm UI
+6(A) c20f43d (HEAD -> feature/lambda_migration) Merge branch 'feature/version2' into feature/lambda_migration
+	 18c07cb Merge branch 'feature/version1' into feature/lambda_migration
+
+------------------------------------------------------------
+Cherry picking:
+------------------------------------------------------------
+
+1(A) git checkout main
+	 git branch feature/lambda_migration2
+2(A) done as described on Pycharm UI
+3(A) done as described on Pycharm UI
+4(A) .env and config.json
+5(A) Yes, you should care because they can be related. For example, if the 1st commit creates “file.txt” and the
+     2nd commit updates “file.txt”, you can’t reverse the order of picking.
+
+------------------------------------------------------------
+Changes in working tree and switch branches:
+------------------------------------------------------------
+
+1(A) done as described
+2(A) touch take.txt
+	 echo "How are you?" >> take.txt
+	 echo "I am fine, thank you." >> take.txt
+	 git add take.txt
+3(A) git checkout dev
+
+	 The error is:
+	 	 "error: Your local changes to the following files would be overwritten by checkout:
+			 take.txt
+	 Please commit your changes or stash them before you switch branches.
+	 Aborting"
+
+	 The two suggested approaches are: one approach is to commit the changes before switch branches and the
+	                                   2nd option is to stash the changes.
+
+4(A) done as described on Pycharm UI
+5(A) No, it contains “a”, “b” and “c”
+6(A) No, take.txt is missing. “Force Checkout” remove all uncommitted changes (in index and working copy).
+
+------------------------------------------------------------
+Reset:
+------------------------------------------------------------
+
+1(A) git checkout reset_question
+
+2(A) 1. git reset --soft HEAD~1 --> removes the last commit but the file changes will stay in your working tree. Also the changes will stay on your index
+        (The file "10" is uncommitted and is now in index) becomes green and is ready to be committed. The HEAD is now the previous commit ("9").
+
+	 2. git reset --mixed HEAD~1 --> removes the last commit from the current branch, changes in your working tree are kept but not on the index.
+     	both "9" and "10" become red (untracked files) the HEAD is now the previous commit ("8")
+
+	 3. git reset --hard HEAD~1 --> remove all (1) Uncommited changes, (2) Changes in the last commit, (3) Changes in the working tree
+	    (you need to use git clean -df if you want to clear the untracked files manually).
+		The file "8" uncommitted and removed, the HEAD is now the previous commit ("7")
+
+	 4. git revert HEAD~1 --> Delete the changes from the previous commit (the file "6" is removed) and creates new commit with
+	    this change. (HEAD is now the new commit).
+
+3(A) HEAD~1 is the previous commit from the current HEAD (HEAD~1 refers to the commit's first parent)