If you could be more specific about what exactly is giving you trouble, then I'm sure someone here can provide assistance and answers.
Deleting files on the Mac is not difficult. Using a mouse and/or a trackpad, single or multiple files can be selected simultaneously and deleted easily by dragging or with keystrokes. That is unless there is some underlying problem with the hardware or software.
Delete files and folders on Mac - Apple Support
Organize your files in the Finder on Mac - Apple Support
And if accessibility is an issue for you then I'm sure there are alternative means of using and controlling the computer. In my opinion Apple has been a leader when it comes to accessibility features on its computers, as is evident in the System Settings > Accessibility control panels of macOS.
Get started with accessibility features on Mac - Apple Support
As for spell check, there's no need for any third-party app for that. Spelling and grammar checking is built into the Mac's OS. There is, in fact, a Dictionary app built installed with the macOS. You can find it by clicking the Launchpad icon on the Dock, or by navigating in a Finder window to the Applications folder.
Get typing suggestions and correct mistakes on Mac - Apple Support
Dictionary User Guide for Mac - Apple Support
Being that you are a long time Windows user, I believe you're going to have to approach using the Mac with a bit of patience and an open mind, and be willing to unlearn some old habits learn some new ones. The two platforms are similar but different. 🙂
