Free legal Books

1. Convex Optimization (볼록 최적화), Stanford University [PDF]

2. https://www.e-booksdirectory.com/listing.php?category=408

1. Project Gutenberg [website]

2. https://english-e-reader.net/

3. Open Library | https://openlibrary.org/

4. Cultural Heritage | https://archive-it.org/

5. Standard Ebooks | https://standardebooks.org/

6. Free public domain audiobooks | https://librivox.org/

7. Freebook Sifter | https://www.freebooksifter.com/

1. https://bookboon.com/en/statistics-ebooks

2. https://www.datasciencecentral.com/profiles/blogs/5-free-statistics-ebooks-you-need-to-read-this-autumn

In English

1. Blender Manual | https://easyblend.org/html/contents.html

2. Blender basics, 5th edition | https://www.cdschools.org/cms/lib04/PA09000075/Centricity/Domain/81/BlenderBasics_5thEdition2017.pdf | https://www.cdschools.org/site/Default.aspx?PageID=455

In Korean

1. Blender Korean manual | https://docs.blender.org/manual/ko/2.81/

2. Blender Lego modeling in Korean (really nice teaching) | https://www.youtube.com/watch?v=dYcqow2t0Mo&index=7&list=PL346E9975224DC7A8

3. Naver café for learning Blender | http://cafe.naver.com/blender3d

1. LaValle's Textbook | http://vr.cs.uiuc.edu/ | http://vr.cs.uiuc.edu/vrbookbig.pdf