diff --git a/lv0/tips.md b/lv0/tips.md new file mode 100644 index 0000000..e69de29 diff --git a/lv1/tips.md b/lv1/tips.md new file mode 100644 index 0000000..e69de29 diff --git a/lv2/tips.md b/lv2/tips.md new file mode 100644 index 0000000..e69de29 diff --git a/lv3/tips.md b/lv3/tips.md new file mode 100644 index 0000000..e69de29