Who knows how to learn descriptive geometry? . .

I can introduce some books to you:

Descriptive geometry and mechanical drawing (I) (Xu Bingsong et al. )

Descriptive Geometry and Mechanical Drawing (Volume II) (Xu Bingsong et al.)

Descriptive geometry and mechanical drawing problem sets (Xu Bingsong et al. )

Descriptive Geometry and Mechanical Drawing (2nd Edition) (He Zhiping et al.)

Descriptive Geometry and Mechanical Drawing Problem Set (Second Edition) (He Zhiping)

Descriptive Geometry (5th Edition) (Dalian University of Technology) (National Award for Excellence)

Descriptive Geometry Problem Set (Third Edition) (Dalian University of Technology)

Mechanical Drawing (4th Edition) (Dalian University of Technology) (First Prize of Education Committee)

Mechanical Drawing Problem Set (Third Edition) (Dalian University of Technology)

Mechanical Drawing (3rd Edition) (Tsinghua University) (First Prize of Education Committee)

Mechanical Drawing Problem Set (Second Edition) (Tsinghua University)

Descriptive Geometry and Mechanical Drawing (4th Edition) (Huazhong University of Science and Technology, etc. ) (First Prize of Education Commission)

Descriptive geometry and mechanical drawing problem sets (fourth edition) (Huazhong University of Science and Technology, etc. ) (First Prize of Education Commission)

Mechanical Drawing (4th Edition) (Tongji University) (National Excellence Award)

Mechanical Drawing Problem Set (4th Edition) (Tongji University)

Architectural Drawing (3rd Edition) (Zhu Fuxi) (Second Prize of Education Commission)

Architectural Drawing Problem Set (3rd Edition) (Le Heqing)

Descriptive geometry (Zhu)

Descriptive Geometry Exercise Set (Zhu)

Civil engineering drawing (Zhu)

Civil engineering drawing problem set (Zhu)

Descriptive Geometry and Hydraulic Engineering Drawing (3rd Edition) (Hohai University)

Descriptive geometry and hydraulic engineering drawing problem set (third edition) (Hohai University)

Descriptive Geometry and Engineering Drawing (2nd Edition) (Xi Jiaotong University) (First Prize of Education Committee)

Descriptive Geometry and Engineering Drawing Problem Set (2nd Edition) (Xi Jiaotong University)

Engineering drawing (Gao Junting)

Engineering Drawing Problem Set (Gao Junting)

Mechanical drawing (Li Cheng, etc.)

Mechanical drawing problem sets (Li Cheng et al. )

Mechanical drawing (Zhou)

Mechanical drawing problem set (Zhou)

Architectural drawing (He Mingxin)

Architectural Drawing Problem Set (He Mingxin)

Basic Painting (Joe) (Second Prize of Education Commission)

Basic Drawing Problem Set (Joe) (Second Prize of Education Committee)

Hope useful to you

Oh, let me help you!