The internet is full of lists with "50 tools every entrepreneur needs". Most are sponsored. Here's what you actually need, nothing more.
Email: An email address with your business name (you@yourbusiness.com). Costs around SEK 50-100/month via Google Workspace or Microsoft 365. Free alternative: use Gmail but always send from a professional address.
Invoicing: Fortnox (free basic version) or Visma. Send clean invoices, track who's paid. That's enough to start.
Website: Five pages that tell people who you are and what you do. Costs SEK 8,000-15,000 if you hire us, or build it yourself with WordPress (free software + hosting SEK 100-150/month).
Calendar: Google Calendar. Free. Book meetings, set reminders, share with clients if you want.
Notes: Google Docs or Notion (free). Write quotes, document projects, save customer info.
That's it. Really. You don't need a CRM system on day 1. You don't need project management. You don't need marketing automation. Start simple. Add tools when you actually need them, not because some blog said you "must have" them.