diff --git a/TODO b/TODO
index 57f8784..1e36657 100644
--- a/TODO
+++ b/TODO
@@ -193,3 +193,10 @@ https://www.youtube.com/watch?v=S4FnmSeRpAY
 
 Distributed Locks
 https://www.youtube.com/watch?v=v7x75aN9liM
+
+
+Interesting questions:
+
+What is the maximum number of TCP connections one machine/container/application can hold?
+What is the limitation on goroutines?
+How goroutines work on multicore?
diff --git a/resources/topic-graph.mmd b/resources/topic-graph.mmd
index d4e396d..5d53ebf 100644
--- a/resources/topic-graph.mmd
+++ b/resources/topic-graph.mmd
@@ -31,7 +31,7 @@ graph TD
       DS --> Semaphore
       DS --> Graph[Graph]
       DS --> T3[Tree]
-      DS --> HS[HashMap/Table]
+      DS --> HS[HashMap/HashTable]
 
     SW --> DB[Databases]
       DB --> DBT[Theory]
diff --git a/resources/topic-graph.png b/resources/topic-graph.png
index c2bd0b9..6598c7d 100644
Binary files a/resources/topic-graph.png and b/resources/topic-graph.png differ