Learning RPG IV advanced techniques

Hi all,
hope you are fine and healthy.

I am here to ask for help on learning RPG IV advanced techniques, hoping
this won't be considered off-topic.

During the last decade, I have gone through all RPG IV enhancement all by
myself, reading books, looking for articles, looking over Stackoverflow
questions and, of course, through this amazing forum-like mailing list. The
company I worked for didn't agree with my hunger of knowledge, so I did
everything I could to improve my skills alone, with an eye to my pocket.

Now, a few months ago I started a new job where all my expertise can make a
difference in the transition to a more modern programming style, but I
realized that there are some critical concepts which I don't master very
well, that meaning I may struggle about a single compilation for days
simply trying to understand what's wrong and guessing what changes to make
to have the job done. Sometimes, following some of the threads of this
group it's difficult for me as well.

These critical topics are about dynamic use of memory, pointers, and most
of all procedures, service programs, so on and so forth. I feel I need a
structured course or workshop where I can confront my errors with a teacher
and have an organized vision of all of these advanced RPG IV techniques.

As I am not in a position to ask my current company to pay for me, I am
here to ask whether you know about some qualified online training I can
take to fulfil the gap, with reasonable prices.

I made some researches but the prices are unaffordable to me, being usually
more than $2500 for 3-4 days.

Finally, I resolved to ask you for some information in case some of you do
this job.

Thank you very much

Lucia