Another common issue, you might encounter with wrong chocolate to liquid ratio, is broken ganache. To create smooth ganache texture, you need a balance between liquids (cream) and fats (chocolate). You might know that chocolate contains decent about of fats, i.e. cocoa butter. And as any water-in-fat emulsions the balance is everything. There are more factors on ganache separation, but one of the most obvious is wrong chocolate to cream ratio. You can find the full article about other reasons here:
https://theconfit.com/blog/why-does-ganache-splitAs you might see, the chocolate ganache ratio is a basic knowledge you would like to obtain sooner rather than later to avoid ruining your creations. But you may ask me: