There are a lot of resources for editing pdf documents and for me it has been difficult to find one that doesn't require a large monthly subscription or upfront fee to download the software (I want to know what I'm getting before I commit to buying it if possible). One editor I really like is PDF Pro,
https://www.pdfpro.co
With PDF Pro you can covert documents from Microsoft Word, Excel, PowerPoint, Publisher) without having to install any software, so all your documents are saved in the cloud.They also have a pay as you go service and allow you to download your first PDFs for free so you can test it out and decide if you like it.