Early stage SaaS startup channels / marketing?

There's no one-size-fits-all answer to this question - it depends on your specific product and target market. However, in general, I've found that the following channels have worked best for early stage SaaS startups:

1. Social media - This is a great way to reach a large number of potential customers at relatively low cost. Just make sure you're targeting the right platforms (e.g. LinkedIn if your product is business-focused) and using effective strategies (e.g. influencer marketing).
2. Content marketing - A well-executed content marketing strategy can help you attract leads and build trust with your target audience. Just make sure your content is high-quality and relevant

At the early stage of SaaS startup LinkedIn (helped to connect professionals) apart from that though SEO helps at early stage we need SEM along to reach more (twitter, social handles helps for brand reach) build community.