How can I make a logo on my laptop for free?

I'm interested in creating a logo for my new cryptocurrency project, but I'm on a tight budget. So, how can I design a logo on my laptop for free? Are there any reliable online tools or software that allow for logo creation without any upfront costs? I'm not expecting a professional-grade logo, but something that can represent my brand and project adequately. Additionally, I'd appreciate any tips or tricks to ensure the logo is visually appealing and effective in conveying my brand message.