I was reading some articles about Bitcoin's future price predictions and a lot of them states that Bitcoin can exceed the all-time highs and even reach $20,000 or $25,000. Do you agree with these forecasts?

Here is the main article: https://www.bitdegree.org/tutorials/how-high-will-bitcoin-go

I personally took my first steps in learning solidity with Bitdegree. They have this interactive and gamified solidity course for beginners. I saw that they also have an intermediate level solidity course but I didn't catch the time to try it yet. Here is the link:
https://www.bitdegree.org/course/learn-solidity-space-doggos

I also agree with AfriDylan about Hackr.io site, I recently found it and it seems to be a very good source for finding various programming courses. How they work is that anyone can submit a course but at least 66% of moderators need to confirm it in order to include the course on the website. And they have some listing rules which prevents listing crapy content. So I think this is a trustable source.

Hello, I also know that SpectroCoin offers bitcoin payment integration solutions for merchants, I use their site for crypto storage and exchange and I saw that they have such service. Maybe someone will find it useful

I was just browsing the web looking for some information about blockchain programming and your link appeared in the search results