I invested quite some time, roast my LP without mercy

Hey, I think it's pretty clear, and you already have a lot of great feedback from @SeanKirby. I would add that for someone interested in taking a course, they often want to know a few things like:

• How long it's going to take
• Whether they can learn at their own pace
• What are the "passing" requirements
• What kind of accreditation they would get, even if its just some kind of completion badge they can post on LinkedIn
• What support they will have from tutors, mentors, etc.
• Whether there is a community component, e.g. do they get to connect with fellow learners, are there work groups, etc.

Is the term "transfer courses" something that is used by developers? I get the idea that it's applying transferrable skills, and I understand what the offering is with the full context of the rest of the page, but it's not immediate at a glance. That said, I don't have a tech background, so I'm not your target audience.

The hero area would also be stronger by including a benefit. Don't simply say what you're offering. Persuade people that what your offering is going to help them more than the alternatives. Give people a good reason to scroll down the page to learn more of click the CTA.

Free is always a good selling point, but it's practically hidden on the page. You just have it in one spot in the smallest font on the page. I'd make the callout bigger, add it to the CTA, and repeat it one or two times throughout the page. You could also emphasize the value of the free offer by showing a price for the courses crossed out with free next to it.

I would also add urgency by emphasizing the limited-time nature of the offer. If you have a specific expiration that that would be good. You could even add a countdown timer to drive it home. If you don't have an expiration date, you could limit the number of seats available.

If you have any social proof, that would help build credibility.

I would add CTA buttons below each of the courses offered so that people know what you want them to do. It's not evident that those areas are clickable unless you scroll over them. Plus, the CTA buttons draw more attention and provide clear direction.

For the two coming soon courses, why not include CTAs to reserve spots when they become available?

Hope that helps. Best of luck!