diff --git a/src/BoardSwitcher.js b/src/BoardSwitcher.js
index 61ad96f..ef145de 100644
--- a/src/BoardSwitcher.js
+++ b/src/BoardSwitcher.js
@@ -1,36 +1,58 @@
-import React from 'react';
+// react is a library is imported to use methods such as compenents
+import React from "react";
 
+// for each component you will have different files, each compenent has one purpose. Modularidy is key.
 class Board extends React.Component {
-  render() {
-    let className = "board";
-    if (this.props.selected) {
-      className += " selected";
-    }
-    return (
-      <div className={className}>
-        {this.props.index + 1}
-      </div>
-    );
-  }
+	// asynchronis, and renders every single thing inside
+	render() {
+		let className = "board";
+		console.log(this.props);
+		if (this.props.selected) {
+			className += " selected";
+		}
+		return <div className={className}>{this.props.index + 1}</div>;
+	}
 }
+//BoardSwitcher is called first because Board is called inside
 
 class BoardSwitcher extends React.Component {
-  render() {
-    let boards = [];
-    for (let ii = 0; ii < this.props.numBoards; ii++) {
-      let isSelected = ii === 0;
-      boards.push(
-        <Board index={ii} selected={isSelected} key={ii} />
-      );
-    }
+	constructor(props) {
+		super(props);
+		this.state = {
+			index: 0,
+		};
+	}
+	handleToggle(event) {
+		// this.setState({
+		//  index:(this.state.index + 1 ) % 3
+		// })
+		if (this.state.index < 2) {
+			this.setState({
+				index: this.state.index + 1,
+			});
+		} else {
+			this.setState({
+				index: 0,
 
-    return (
-      <div>
-        <div className="boards">{boards}</div>
-        <button>Toggle</button>
-      </div>
-    );
-  }
+			});
+		}
+	}
+
+	render() {
+		let boards = [];
+
+		for (let ii = 0; ii < this.props.numBoards; ii++) {
+			let isSelected = ii === this.state.index;
+			boards.push(<Board index={ii} selected={isSelected} key={ii} />);
+		}
+
+		return (
+			<div>
+				<div className="boards">{boards}</div>
+				<button onClick={(e) => this.handleToggle(e)}>Toggle</button>
+			</div>
+		);
+	}
 }
 
 export default BoardSwitcher;