diff --git a/lessons/images/ArrayList.PNG b/lessons/images/ArrayList.PNG
new file mode 100644
index 00000000..0270b04c
Binary files /dev/null and b/lessons/images/ArrayList.PNG differ
diff --git a/lessons/images/hashcode.PNG b/lessons/images/hashcode.PNG
new file mode 100644
index 00000000..69a07e66
Binary files /dev/null and b/lessons/images/hashcode.PNG differ
diff --git a/lessons/images/set.PNG b/lessons/images/set.PNG
new file mode 100644
index 00000000..1db2babb
Binary files /dev/null and b/lessons/images/set.PNG differ
diff --git a/static/ArrayList.PNG b/static/ArrayList.PNG
new file mode 100644
index 00000000..0270b04c
Binary files /dev/null and b/static/ArrayList.PNG differ