It's hard to say what software is the best, but I've always been comfortable with this editor.

PDF can be directly read and edited, watermark can be modified, and background can be changed. The most important thing is that the tablet computer can directly edit the stylus, which is convenient for students to learn to take notes and work, including some functions such as highlighting and underlining, which enriches the usability of notes.

And collected the format conversion function needed by PDF editor, which can directly process images, which is really powerful.

And can also handle encrypted files and document security.

You can directly organize and batch operate pages.

Delete, change the order, etc.

So my tablet has been using this Wanxing PDF expert to edit notes and teaching materials, and the computer is used to process documents.