@imwsl90 If you want to be more professional, you can use drawio.
In addition to mind maps, you can switch to other forms at any time, such as some frame diagrams, flow charts, design drawings, etc.
It is free and you can export pictures.
I have been using it for seven or eight years and can use it in work and life.
If you want hand-drawn style, the last picture is a rendering, you can choose Excalidraw

