If you are engaged in R&D, you can write about R&D projects, including: the purpose of R&D, the idea of R&D, the testing process, the difficulties encountered and solutions, the final results of R&D and so on.

If you are running the project site, you can write down the project you are responsible for, including: project introduction, problems encountered in project installation and debugging, solutions, project acceptance and so on.

If you are in the workshop, you can write down the problems existing in the workshop you are responsible for and their solutions, and you can also put forward some new opinions on the process or equipment.

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In this way, it is best to review the work-related papers and experience them for yourself. Depth is mainly to show your ability or viewpoint to solve practical problems, remember to talk in general terms.