If you've got cofounders and/or employees you've got a team. Even if you've got only one other person, it's important to cultivate the relationship on an operational level but also develop each other. Stick to a schedule of team building, one and ones for mutual feedback, and regular standup to openly discuss what is working and what needs to change and WHY this is so. As your team grows and business is moving fast it will be a challenge to keep this up and the temptation will be to defer this type of activity. Filling up, nurturing, and developing the human beings around you is one of the greatest tasks you'll face. Do not kick this down the road or people will churn out and when you need them, they won't be there.
You should complete the following tasks before proceeding to the current one.
At this stage you may have a team of co-founders and / or some early employees or even contractors working with you. Teams naturally go through stages of building trust, skill, and competency. While you are working and spending a lot of time together, it is never too early to find ways to build that connection and give your team members a needed break from the grind. Team building can be as easy as having a coffee or beverage together or something more structured and involved. Just be mindful of 'mandatory fun' or something that feels inauthentic. Also respect time since they are already committing hours to be in your company. It's often a lot to ask for them to attend even MORE events on their own time.
List of resources, subject matter experts, trusted partners, and tools that can be useful to complete the task.
Don't stop now! Just pick the very next stage-card that resonates with your business and continue working on the correspondent tasks.