diff --git a/03.Basic_Concepts_II.pdf b/03.Basic_Concepts_II.pdf
index 78ffd08..c9a920a 100644
Binary files a/03.Basic_Concepts_II.pdf and b/03.Basic_Concepts_II.pdf differ
diff --git a/README.md b/README.md
index 8b103e7..38a0751 100644
--- a/README.md
+++ b/README.md
@@ -108,15 +108,6 @@
 * Concurrency
 * C++ Guidelines
 
-### todo ###
-
-* (01) Basic Concepts I -> Catastrofic Cancellation (loss of significance)
-* (09) Code Organization and Conventions -> optimize the compile time
-* (11) Advanced Concepts -> volatile keyword
-* (12) Code Optimization
-* (B) Appendix
-* C++17
-
 ### Reporting bugs and contributing ###
 
 If you find any typos please report them by using the repository
diff --git a/ToDo.md b/ToDo.md
new file mode 100644
index 0000000..074f0d3
--- /dev/null
+++ b/ToDo.md
@@ -0,0 +1,8 @@
+## Todo ##
+
+* (01) Basic Concepts I -> Catastrofic Cancellation (loss of significance)
+* (09) Code Organization and Conventions -> optimize the compile time
+* (11) Advanced Concepts -> volatile keyword
+* (12) Code Optimization
+* (B) Appendix
+* C++17
diff --git a/html/OnlineCompiler.html b/html/OnlineCompiler.html
index c194de5..25b7876 100644
--- a/html/OnlineCompiler.html
+++ b/html/OnlineCompiler.html
@@ -4,7 +4,6 @@
 <font size="6">
 <br>
 <br>
-<br>
 <a href="https://wandbox.org/"> Wandbox </a> <font size="5">(support different compilers)</font>
 <br>
 <br>
@@ -22,6 +21,9 @@
 <br>
 <br>
 <a href="https://aws.amazon.com/it/cloud9/">  Cloud9 </a> (online virtual machine)
+<br>
+<br>
+<br>
 </font>
 </body>
 </html>