Hi @Georgi Kostadinov ,
Here are some basic lessons about SSIS package in Microsoft documentation, you may take a reference.
integration-services-tutorials
You may also refer this which provides a lot SSIS blogs.
In addition, practice makes perfect, you may join us to be a SSIS Q&A expert to help resolve the SSIS issues.
There will be several real SSIS cases everyday which need experts' help.
Regards,
Zoe
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