To earn money online through affiliate marketing, follow these steps:

Choose a Niche: Select a niche that interests you and has a good potential audience. This could be anything from technology to health and wellness.
Find Affiliate Programs: Join affiliate programs relevant to your niche. You can find these through affiliate networks like Amazon Associates, ClickBank, ShareASale, or directly through companies' websites.
Select Products to Promote: Choose products or services that align with your niche and that you genuinely believe in. Quality and relevance are key to building trust with your audience.
Build a Platform: Create a platform where you can promote your affiliate products. This could be a blog, YouTube channel, social media accounts, or a combination of these.
Create High-Quality Content: Produce valuable content related to your niche. This could include product reviews, tutorials, comparison articles, or recommendations. Make sure your content is informative, engaging, and helpful to your audience.
Drive Traffic: Drive traffic to your content through various channels such as search engine optimization (SEO), social media marketing, email marketing, or paid advertising.
Include Affiliate Links: Incorporate affiliate links naturally within your content. Make sure to disclose your affiliate partnerships to your audience to maintain transparency.
Optimize for Conversions: Continuously analyze your performance and optimize your strategies to maximize conversions. This may involve experimenting with different types of content, promotional methods, or affiliate products.
Build Relationships: Focus on building trust and relationships with your audience. Engage with them through comments, emails, or social media interactions.
Track and Analyze Results: Use tracking tools provided by affiliate programs or third-party analytics to monitor your performance. Pay attention to metrics such as clicks, conversions, and revenue to understand what's working and what isn't.
By consistently providing valuable content and promoting relevant products, you can earn commissions through affiliate marketing. Remember that success in affiliate marketing takes time, effort, and patience.