diff --git a/courses/free-courses-en.md b/courses/free-courses-en.md
index 220e3cd4497c810a88e13e898e3db1fc0e667069..37296705b76026672db1ef83973488c5cc1d9e66 100644
--- a/courses/free-courses-en.md
+++ b/courses/free-courses-en.md
@@ -64,6 +64,7 @@
 * [Rust](#rust)
 * [Scala](#scala)
 * [Security](#security)
+* [Solidity](#solidity)
 * [Swift](#swift)
   * [Vapor](#vapor)
 * [Theory](#theory)
@@ -810,6 +811,12 @@
 * [Zero to Hero: A Practical Network Penetration Testing Course](https://www.youtube.com/playlist?list=PLLKT__MCUeiwBa7d7F_vN1GUwz_2TmVQj) - The Cyber Mentor
 
 
+### Solidity
+
+* [Learn Solidity](https://youtube.com/playlist?list=PL16WqdAj66SCOdL6XIFbke-XQg2GW_Avg) - Will it Scale (Youtube)
+* [MASTER Solidity for Blockchain](https://youtube.com/playlist?list=PLS5SEs8ZftgVnWHv2_mkvJjn5HBOkde3g) - Dapp University (Youtube)
+
+
 ### Swift
 
 * [100 days of Swift](https://www.hackingwithswift.com/100) - Hacking With Swift
diff --git a/more/free-programming-cheatsheets.md b/more/free-programming-cheatsheets.md
index c62097070dbba8b44b681f73fd58f73a026cc8a7..bf100a9ca86d94a4e739093be50b028556b28415 100644
--- a/more/free-programming-cheatsheets.md
+++ b/more/free-programming-cheatsheets.md
@@ -27,6 +27,7 @@
 * [R](#r)
 * [Ruby](#ruby)
 * [Rust](#rust)
+* [Solidity](#solidity)
 * [SQL](#sql)
 
 
@@ -197,6 +198,12 @@
 * [Rust Language Cheat Sheet](https://cheats.rs) (HTML)
 
 
+### Solidity
+
+* [Solidity Cheat Sheet](https://intellipaat.com/mediaFiles/2019/03/Solidity-Cheat-Sheet.pdf) - IntelliPaat (PDF)
+* [Solidity Cheatsheet and Best practices](https://manojpramesh.github.io/solidity-cheatsheet/) - Manoj Ramesh
+
+
 ### SQL
 
 * [MySQL Cheatsheet](https://s3-us-west-2.amazonaws.com/dbshostedfiles/dbs/sql_cheat_sheet_mysql.pdf) - Database Star (PDF)
diff --git a/more/free-programming-interactive-tutorials-en.md b/more/free-programming-interactive-tutorials-en.md
index 3c48b98d300b5531fbffaa07b7b079186a170a39..cc8c2746709f3fc0abea048f592239d0751bfdaa 100644
--- a/more/free-programming-interactive-tutorials-en.md
+++ b/more/free-programming-interactive-tutorials-en.md
@@ -41,6 +41,7 @@
 * [Rust](#rust)
 * [Scala](#scala)
 * [Selenium](#selenium)
+* [Solidity](#solidity)
 * [SQL](#sql)
 * [Vim](#vim)
 
@@ -339,6 +340,11 @@
 * [Selenium Tutorial - Web Automation](http://www.techbeamers.com/selenium-webdriver-tutorial)
 
 
+### Solidity
+
+* [CryptoZombies.io](https://cryptozombies.io) - Loom Network
+
+
 ### SQL
 
 * [Intro to SQL: Querying and managing data](https://www.khanacademy.org/computing/computer-programming/sql) - Khan Academy
diff --git a/more/free-programming-playgrounds.md b/more/free-programming-playgrounds.md
index 5e955796adadd5c96135b327b4e0433c80a8b2a5..29817b2b76235adcea0cb1b888e7606898570024 100644
--- a/more/free-programming-playgrounds.md
+++ b/more/free-programming-playgrounds.md
@@ -250,7 +250,8 @@
 
 ### Solidity
 
-* [Remix IDE](https://remix.ethereum.org)
+* [ETH.Build](https://eth.build) - Austin Thomas Griffith
+* [Remix IDE](https://remix.ethereum.org) - ethereum.org
 
 
 ### SQL