Try using Adobe XD. It’s free and you can test it on mobile and add interactions, animations and flows.
Sketch for me is too static, you would need Invision and other tools. It gets messy. With Adobe XD its just one clean professional tool for free.
Regards
PS. I’ve been a Product Designer for more that 20 years, I’ve used tools like Sketch, Figma, Uxpin and others and the best way for you to find out is to just start playing around with them. Different tools are good for different levels.