The choice really depends on the type of side hustle you're interested in. If you want to find clients, you can explore websites such as Upwork, Freelancer.com, or JobStreet for part-time opportunities. It's a good idea to have detailed samples of your past work prepared to show your potential clients what you can bring to the table.
If you're planning to sell things online, you can use online shop builders like Shopify or Wix to set up your store, without the need for extensive coding or technical skills. You can also sign up your store on established e-commerce platforms like Lazada or Shopee. Also, consider reaching out to people on your personal network – they could be potential clients too.