diff --git a/lesson-3/README.md b/lesson-3/README.md
index 64fb3cc..9dcb8db 100644
--- a/lesson-3/README.md
+++ b/lesson-3/README.md
@@ -25,8 +25,8 @@
 
 ## Linux installation instructions
 
-1. Install curl if you haven't got it already by typing `sudo apt install curl`
-2. Install *Node.js* by first typing `curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -` which will fetch source files for the apt package. Then type `sudo apt update` to download the package lists from the repositories and updates them to get information on the newest versions of packages and their dependencies. Then type `sudo apt-get install -y nodejs` to get Node.js installed. For latest instructions you can always go to [official Node.js insllation isntructions](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions).
-3. Install *Geth* by first typing `sudo add-apt-repository -y ppa:ethereum/ethereum` to add Ethereum to apt source list. Then `sudo apt update` and finally `sudo apt install ethereum`.
+1. Install curl if you haven't got it already by typing `sudo apt-get install curl`
+2. Install *Node.js* by first typing `curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -` which will fetch source files for the apt package. Then type `sudo apt-get update` to download the package lists from the repositories and updates them to get information on the newest versions of packages and their dependencies. Then type `sudo apt-get install -y nodejs` to get Node.js installed. For latest instructions you can always go to [official Node.js installation instructions](https://nodejs.org/en/download/package-manager/#debian-and-ubuntu-based-linux-distributions).
+3. Install *Geth* by first typing `sudo add-apt-repository -y ppa:ethereum/ethereum` to add Ethereum to apt source list. Then `sudo apt-get update` and finally `sudo apt-get install ethereum`.
 4. Install *testrpc* by typing `sudo npm install -g ethereumjs-testrpc`.
-5. Install *truffle* by typing `sudo npm install -g truffle`.
\ No newline at end of file
+5. Install *truffle* by typing `sudo npm install -g truffle`.
diff --git a/lesson-7/README.md b/lesson-7/README.md
index b692a7b..da288ea 100644
--- a/lesson-7/README.md
+++ b/lesson-7/README.md
@@ -32,7 +32,7 @@ Public functions are part of the contract interface and can be either called int
 
 ## `internal`
 
-Interval functions and state variables can only be accessed internally (i.e. from within the current contract or contracts deriving from it), without using `this`. 
+Internal functions and state variables can only be accessed internally (i.e. from within the current contract or contracts deriving from it), without using `this`. 
 
 `internal` can be compared to `protected` visibility in object-oriented languages such as Java.
 
@@ -119,4 +119,4 @@ contract ChattyInherited is Chatty {
 ## Resources
 
 - http://solidity.readthedocs.io/en/develop/contracts.html?highlight=visibility#visibility-and-getters
-- https://ethereum.stackexchange.com/questions/19380/external-vs-public-best-practices?answertab=active#tab-top
\ No newline at end of file
+- https://ethereum.stackexchange.com/questions/19380/external-vs-public-best-practices?answertab=active#tab-top