I would like to create visually appealing diagrams for my publications. For instance, to create graphical abstracts for articles, I want to know which computer tool can assist me in this regard.
Dear Naous Mohamed Have a look at https://www.researchgate.net/post/Best-graphics-program-for-making-scientific-illustrations-for-journal-articles for various good (and bad) suggestions.
Personally I used BioRender (https://www.biorender.com ) recently. It is a rather user-friendly tool (with limitations). You can try for free to see if it suits you. The only real drawback, it is not for free once you need publication quality images/illustrations.