One of the best books I have ever read is “Writing Science: How to Write Papers That Get Cited and Proposals That Get Funded” https://www.amazon.com/dp/0199760241/ref=cm_sw_r_cp_tai_6MpxCb2Y2PH49
The book is easy to read and has DRASTICALLY improved my science writing. I read this book with my undergraduate lab (like 4 years ago) and still reference now in my PhD program.
Joshua Schimel's Writing Science book is fantastic, especially for bio/eco folks.
I very much recommend the book <em>Writing Science</em>, by Joshua Schimel. You wouldn't know from the title, but it's one of the best books on writing (academic or otherwise) ever written. I'm actually putting together a graduate-level course based on the book for next year!
If your fiction is suffering from contact with stiff, over-formal academic writing, this book can help.
As the other poster said, you should look at examples from your field/program/group. Examples of previous students are some of the best places to learn what belongs in your manuscript.
If you're in STEM then I'd recommend the book, Writing Science, by Schimel:
https://www.amazon.com/Writing-Science-Papers-Proposals-Funded/dp/0199760241
It's a great primer on what makes a good paper. The style and way of thinking presented in that text, combined with analyzing previous dissertations, is what I've used to write my dissertation.
You should also ask your PI for any of their prior students' dissertations that stand out as a good example. They'll likely have some that they can name and possibly send to you.
There are some good book resources if you want to take the time to read through them. Schimel's <em>Writing Science: How to Write Papers That Get Cited and Proposals that Get Funded</em> seems pretty well recommended on Amazon.
We read this book in a graduate writing seminar I took this semester. It was the first book we read and I thought it had some great ideas on how to develop a writing schedule and stick to it. We followed it with "Writing Science" by Josh Schimel which really gets into the details of how to write WELL, not just a lot. It's much more dense but worth looking into if you're committed to improving your writing. :)
Reading journal articles is a good start but be careful because there are many poorly written published articles out there.
A book that could be really helpful is Writing Science - I haven't read it all personally but my supervisor outlined the major points in it before I started writing my thesis and it had some really good advice.
https://www.amazon.com/Writing-Science-Papers-Proposals-Funded/dp/0199760241
Writing Science: How to Write Papers That Get Cited and Proposals That Get Funded
After I read this book and wrote a grant proposal, my advisor told me how much clearer and stronger my writing became. Felt great!
Writing Science: https://www.google.com/books/edition/Writing_Science/Fp4-7EWkvUgC?hl=en&gbpv=1&dq=how+to+write+scientific+papers+book&printsec=frontcover https://www.amazon.com/Writing-Science-Papers-Proposals-Funded/dp/0199760241
It goes over structure of papers, paragraphs, and word choices/order. It covers a lot of material, so it is useful even if some sections may not be (OCAR structure for example).
Writing Science by Joshua Schimel is -excellent-: https://www.amazon.com/Writing-Science-Papers-Proposals-Funded/dp/0199760241
I revisit it all the time! So much good content!
Also, I highly recommend Writing Science: How to Write Papers That Get Cited and Proposals That Get Funded https://www.amazon.com/dp/0199760241/ref=cm_sw_r_cp_apa_i_YUi-CbM4TN2Q0
I second that! Amazon link
Take a look at this recent post. There are some good suggestions in there.
I posted in there, but it still applies here: Writing Science: How to Write Papers That Get Cited and Proposals That Get Funded. Great book, easy to read, and I saw great improvement in my writing.
Some people recommend Elements of Style but myself and many others find it vague and contradictory. Here's a thorough critique of it in the Chronicle!
I personally highly recommend Joshua Schimel's Writing Science. You can buy it on Amazon here! He does an amazing job breaking down poorly written writing and showing you, step by step, how to make it better. The rave reviews on Amazon speak volumes, too.