>> Starting a part time or side earning without investment often involves variety of leveraging your existing skills and resources to obtain the demandable results in creating the successful side earning. 
Here are some areas to earning:
1. Freelancing:
If you have a beginner skills or advanced skills in the area of digital marketing, graphic design, logo design, video editing, image editing or in many other categories, then you have a platforms like Upwork or Fiverr or other online platform to work as part time or full time to earn decent amount as a side income.
Whether it's writing, graphic design, programming, or other talents, freelancing allows you to earn without significant upfront costs. So, knot your determination for the this niche of earning.
2. Online Tutoring:
If you excel in a particular subject, offer tutoring services online. Use free communication tools like Zoom or Skype to teach the tutorial of various niche of your interest.
You can also start a tutorial on YouTube, so you can build a brand with earning decent amount of money without investment.
3. Affiliate Marketing:
Promote other companies products and earn a commission for every sale made through your referral link. This can be done through a blog, social media, or a YouTube channel you have.
You can start also selling digitally by promoting your affiliate link to earn commission. You can get affiliate like by Flipkart, Amazon, Alibaba, etc big website to earn.
4. Content Creation:
Start a blog, YouTube channel, or a podcast. With dedication and quality content, you can attract an audience over time. Just you need a smart phones with good camera.
After getting enough audience you start earning by Ad revenue, premium stuff, etc. And by this you have brand face of yourself or your business.
5. Virtual Assistance:
Offer administrative services to businesses or entrepreneurs. Many tasks can be done remotely.
This is technologically new method to earn money, but if you figure out this will be also made a perfect choice for side income.
6. Social Media Management:
If you're skilled in social media, offer your services to small businesses looking to improve their online presence. Like offering digital service of managing Instagram, Facebook, YouTube account to better and proficient influence of influencers, businessmen or business accounts.
>> Remember, success often comes with time and effort. Focus on providing value, building relationships, and refining your skills.