I mostly suggest this book first:
https://thesecretofbeingyou.com/shop/your-own-authority-a-beginners-guide-to-human_design
also available here:
https://www.ihdschool.com/digital-products/3/your-own-authority-a-beginners-guide-to-human_design
and here:
https://jovianarchive.com/products/your-own-authority-a-beginners-guide-to-human_design

Then, maybe/perhaps, get a Foundation Reading (Individual Rave Analysis):
https://www.ihdschool.com/Professionals

and then this book second:
https://humandesignamerica.com/books/course-manuals/item/60-living-your-design-student-manual
The same book is probably cheaper to get in or near Europe:
https://human.design/products/827/living-your-design-a-manual-for-cellular-transformation

after, one can join a Living Your Design workshop or course anywhere in the world (live/online)

This way you have a solid grasp of both practice and theory and an incredible support for your own process 👍

Maybe/perhaps check out the Free Media Library: https://www.jovianarchive.com/Media_Library

Human Design Ephemeris:

A handy tool to have is one of 3 existing Human Design Ephemerises which you can order at

-New SunWare (common Human Design World Ephemeris online edition): http://newsunware.com/eng/Products/EphemerisPDF.asp
or as a Personal version: https://newsunware.com/eng/Products/PersonalEphemeris.asp

-Zen Human Design (Pocket Ephemeris or per 25 years): http://www.humandesignsystem.com/shop/ephemerides.php

-And this wonderful version https://www.prolinerhd.com/
which is available also as a personalized digital pdf: https://www.prolinerhd.com/product-page/personalized-interactive-pdf
and now also has a mobile Calendar version here: “To install the new calendar to your mobile device please copy (not click!) this link:
https://ics.teamup.com/feed/ks3fhnouj74jswc88w/11192340.ics
Use the link to subscribe through your favorite calendar application.”

Human Design Book list:

There are incredibly many books & ebooks available:
https://humandesignamerica.com/books
https://www.ihdschool.com/digital-products
https://www.jovianarchive.com/eBooks?showAll=true&page=-1
https://human.design/books
https://human.design/pdfs

Freebies: https://www.ihdschool.com/digital-products/2/the-differentiation-lectures
https://humandesignamerica.com/free-material/item/62-the-differentiation-lectures

On Centers: http://www.humandesignservices.de/cms/index.php/produkte/product/109-human_design-system-the-centres-book-b-w-edition
which also has an Amazon link on the page

On Gates: https://humandesignamerica.com/books/reference-books/item/1-rave-iching

On Channels: https://www.ihdschool.com/digital-products/1/the-life-force-channels

Channels & Circuitry: Human Design - Circuitry: The Complete Guide to Circuits, Channels and Gates
https://www.bookfinder.com/isbn/9781913820541/
& https://humandesignamerica.com/books/reference-books/item/17-rave-bodygraph-circuitry

Channels by Type: https://www.ihdschool.com/digital-products/categories/101/channels-by-type

On Lines: https://humandesignamerica.com/books/reference-books/item/16-line-companion

On Crosses: https://humandesignamerica.com/books/reference-books/item/15-incarnation-crosses-the-global-incarnation-index

Crosses by Profile: https://humandesignamerica.com/books/reference-books/item/18-profile-and-type-reference-book

Profiles: https://humandesignamerica.com/books/reference-books/item/18-profile-and-type-reference-book

Connections & Relationships:
“If you allow someone to be who they are and they allow you to be who you are, then that’s love. Anything else is torture.” Ra Uru Hu
https://www.facebook.com/notes/jovian-archive/how-we-connect/1281006088593179/
& https://www.ihdschool.com/digital-products/7/partnership-analysis-student-manual

Love: https://humandesignamerica.com/books/general-education/item/12-love-book

Sexuality: https://human.design/products/828/human-sexuality
& https://humandesignamerica.com/books/general-education/item/10-sexuality-manual

Pregnancy: https://human.design/products/830/the-design-of-pregnancy
& https://www.humandesignsystem.info/product/the-design-of-pregnancy/

Child Development: https://www.ihdschool.com/digital-products/103/child-development-analyst-student-manual

Family: https://www.ihdschool.com/digital-products/100/family-practice-student-manual

Dream Rave: https://www.ihdschool.com/digital-products/categories/100/dream-rave#products from intro to advanced

On Variables: “Variable is to awareness what Type is to form” - Ra Uru Hu
https://www.jovianarchive.com/Media_Library/Videos/35/Variable
and https://www.jovianarchive.com/Get_Your_Variable
&
https://www.ihdschool.com/digital-products/37/the-meaning-of-variable-an-introduction
https://www.jovianarchive.com/Products/56/Introduction_to_Variable
https://www.jovianarchive.com/Products/155/Variables
https://jovianarchive.com/products/radical-transformations (eBook included)
https://www.jovianarchive.com/Special_Offers/17/From_The_Left_and_Right
https://www.ihdschool.com/digital-products/51/the-story-lines

and
https://www.ihdschool.com/digital-products/4/the-human_design-system-a-complete-guide
https://www.jovianarchive.com/Special_Offers/4/A_Complete_Guide_to_Human_Design

Life Cycles: https://www.mcha.nl/2016/03/20/human_design-readings/
https://www.jovianarchive.com/Products/178/Life_Cycles_Analysis
https://www.ihdschool.com/digital-products/31/a-lifes-story