Hi Jordi,
I understand, it's completely normal to get lost because Microsoft Dynamics CRM (now 365) is a big solution.
You can refer to my couple of free training courses which can surely give you an entire picture of what Microsoft Dynamics CRM (now 365) is.
First course: Microsoft Dynamics CRM Introduction Course: (this course has been taken by more than 29K students from over 170 countries) and have over 3100 reviews.
Click here: https://www.udemy.com/microsoft-dynamics-crm-introduction-course/
This would be a great start for you.
Second course: Microsoft Dynamics 365 (CRM, NAV, AX) Intro Training Course (It's a best-selling course on Udemy it's been appreciated by more than 5.7K students)
Click here: https://www.udemy.com/microsoft-dynamics-365-online-training-introduction-course/
This is a paid course on Udemy but if you like to get it for free, you can go through my website:
Here's the website link: www.OnlineCRMTraining.com
(You would need to enter your name & email and you will get a free coupon to Udemy course)
I'm sure these two courses would be sufficient for you to get complete understanding of Microsoft Dynamics CRM (also Dynamics 365).
I would love to know your feedback & I hope this helps.
To Your Success,
Abhay Sharma
Microsoft Certified Trainer (MCT) For Microsoft Dynamics CRM