Button Click to Render Div

You can store an ID as a string state variable, and set that variable on button press.

Then use ConditionalRendering to only display the div with the matching ID.

const {useState} = React;

function About(props) {
  const [visibleItem, setVisibleItem] = useState('');
  return (
    <div>
      <button onClick={() => setVisibleItem("website")}>
        Show Website Develpment
      </button>
      <button onClick={() => setVisibleItem("wordpress")}>
        Show Wordpress Develpment
      </button>
      <button onClick={() => setVisibleItem("ecommerce")}>
        Show Ecommerce Development
      </button>
      
      {visibleItem === "website" && 
        <div>
          <h2>Wordpress Development</h2>
          <p>Info about Wordpress and all the things I can do with it</p>
        </div>
      }     
      
      {visibleItem === "wordpress" && 
        <div>
          <h2>Ecommerce Development</h2>
          <p>I can do eccomerce things too</p>
        </div>
      }      
      
      {visibleItem === "ecommerce" && 
         <div>
          <h2>Website Development</h2>
          <p>Info about Webdev</p>
        </div>
      }
      
    </div>
   );
}

ReactDOM.render(
  <About/>,
  document.getElementById("react")
);

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.8.4/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.4/umd/react-dom.production.min.js"></script>
<div id="react"></div>

If the sections were much bigger then I'd recommend splitting them out into separate components, or maybe doing an if or switch statement to select between them before the return, but the above snippet is a pattern I have used often with react.

You can create two states one holding array of button info to minimize repetition of code and another state to track the column clicked.

 import React, { useState } from "react";
    
    export default function About(props) {
      const [colNum, setColNum] = useState('');
      const [btnNames] = useState([
        {
          colId: 1,
          name: "Website Develpment"
        },
        {
          colId: 2,
          name: "Wordpress Develpment"
        },
        {
          colId: 3,
          name: "Ecommerce Develpment"
        }
      ]);
    
      const handleClick = (id) => {
        setColNum(id);
      };
    
      return (
        <>
          <div className="row justify-content-md-center">
            {btnNames.map(element => (
              <div className="col-auto" key={element.colId}>
                <CustomButton onClick={()=> handleClick(element.colId)}>{element.name}</CustomButton>
              </div>
            ))}
          </div>
    
          {colNum !== '' ? (<div className="row">
            <div className="col-md-4">column {colNum}</div>
            </div>) : null }
          
        </>
      );
    }

So you can define showing value for each section in state, which initial should be false. Then we can handle this state with a function where built-in JS tools can be used (Object.entries, Object.fromEntries and map). The element will be displayed, the value of which will be true, and the rest will automatically become false. More details can be found here: https://codesandbox.io/s/happy-sea-nckmw?file=/src/App.js

import React, { useState } from "react";
import "./styles.css";
import styles from "./TestStyles.module.css";
import CustomButton from "./CustomButton";

export default function App() {
  const [showDiv, setShowDiv] = useState({
    web: false,
    wordpress: false,
    ecommerce: false
  });

  const showDivHandler = (val) => {
    const newState = Object.fromEntries(
      Object.entries(showDiv).map(([key, value]) => [key, (value = false)])
    );

    setShowDiv({
      ...newState,
      [val]: !showDiv[val]
    });
  };

  return (
    <div className="App">
      <h1>Hello CodeSandbox</h1>
      <h2>Start editing to see some magic happen!</h2>
      <div className={styles.Section}>
        <div className="col-auto">
          <CustomButton clicked={() => showDivHandler("web")}>
            Website Develpment
          </CustomButton>
        </div>
        <div className="col-auto">
          <CustomButton clicked={() => showDivHandler("wordpress")}>
            Wordpress Develpment
          </CustomButton>
        </div>
        <div className="col-auto">
          <CustomButton clicked={() => showDivHandler("ecommerce")}>
            Ecommerce Development
          </CustomButton>
        </div>
      </div>
      <div className={styles.Section} style={{marginTop: 20}}>
        {showDiv.web && <div className={styles.Content}>column 1</div>}
        {showDiv.wordpress && <div className={styles.Content}>column 2</div>}
        {showDiv.ecommerce && <div className={styles.Content}>column 3</div>}
      </div>
    </div>
  );
}

The custom button can look like this:

import React from "react";

const button = (props) => (
  <button
    onClick={props.clicked}
    //some other props if need it(e.g. styles)
  >
    {props.children}
  </button>
);

export default button;