diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 69348619..577a9066 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -61,7 +61,7 @@ See [Translations](TRANSLATIONS.md).
 
 ### Adding translations to new languages
 
-Translations to new languages are always welcome! Keep in mind a transation must be maintained.
+Translations to new languages are always welcome! Keep in mind a transaction must be maintained.
 
 * Do you have time to be a maintainer for a new language? Please see the list of [translations](TRANSLATIONS.md) and tell us so we know we can count on you in the future.
 * Check the [translations](TRANSLATIONS.md), issues, and pull requests to see if a translation is in progress or stalled. If it's in progress, offer to help.  If it's stalled, consider becoming the maintainer if you can commit to it.
diff --git a/README.md b/README.md
index 54edea4b..eb07eb7b 100644
--- a/README.md
+++ b/README.md
@@ -1673,7 +1673,7 @@ Handy metrics based on numbers above:
 | Design an online multiplayer card game | [indieflashblog.com](https://web.archive.org/web/20180929181117/http://www.indieflashblog.com/how-to-create-an-asynchronous-multiplayer-game.html)<br/>[buildnewgames.com](http://buildnewgames.com/real-time-multiplayer/) |
 | Design a garbage collection system | [stuffwithstuff.com](http://journal.stuffwithstuff.com/2013/12/08/babys-first-garbage-collector/)<br/>[washington.edu](http://courses.cs.washington.edu/courses/csep521/07wi/prj/rick.pdf) |
 | Design an API rate limiter | [https://stripe.com/blog/](https://stripe.com/blog/rate-limiters) |
-| Design a Stock Exchange (like NASDAQ or Binance) | [Jane Street](https://youtu.be/b1e4t2k2KJY)<br/>[Golang Implementation](https://around25.com/blog/building-a-trading-engine-for-a-crypto-exchange/)<br/>[Go Implemenation](http://bhomnick.net/building-a-simple-limit-order-in-go/) |
+| Design a Stock Exchange (like NASDAQ or Binance) | [Jane Street](https://youtu.be/b1e4t2k2KJY)<br/>[Golang Implementation](https://around25.com/blog/building-a-trading-engine-for-a-crypto-exchange/)<br/>[Go Implementation](http://bhomnick.net/building-a-simple-limit-order-in-go/) |
 | Add a system design question | [Contribute](#contributing) |
 
 ### Real world architectures
diff --git a/generate-epub.sh b/generate-epub.sh
index 18690fbb..c75427f1 100755
--- a/generate-epub.sh
+++ b/generate-epub.sh
@@ -12,7 +12,7 @@ generate_from_stdin() {
 }
 
 generate_with_solutions () {
-  tmpfile=$(mktemp /tmp/sytem-design-primer-epub-generator.XXX)
+  tmpfile=$(mktemp /tmp/system-design-primer-epub-generator.XXX)
 
   cat ./README.md >> $tmpfile
 
diff --git a/solutions/object_oriented_design/online_chat/online_chat.ipynb b/solutions/object_oriented_design/online_chat/online_chat.ipynb
index b9f84ef4..20dae750 100644
--- a/solutions/object_oriented_design/online_chat/online_chat.ipynb
+++ b/solutions/object_oriented_design/online_chat/online_chat.ipynb
@@ -36,7 +36,7 @@
     "        * Post a message to a group chat\n",
     "    * Private 1-1 chat\n",
     "        * Invite a friend to a private chat\n",
-    "        * Post a meesage to a private chat\n",
+    "        * Post a message to a private chat\n",
     "* No need to worry about scaling initially"
    ]
   },