I create a lot of documents, adverts, flyers and so on. Whilst one can use Microsoft Word or LibreOffice, something more specialist makes life a lot easier. My favourite is Affinity Publisher which has lots of capabilities while being remarkably cheap.
However these packages, whilst great, sort of give you a blank canvas. Maybe you want more of a helping hand. In that case Adobe Spark might be more up your street. It’s free and takes you through the creative process with lots of templates and ideas to make your work stand out.