as far as I have checked, to querry SP List which string value CONTAINS specific string i should use filter of type substringof(), but i am not able to construct the querry correctly...
Target list id: "123"
Column name with string value which i want to querry: "TargetColumn"
String value which i am searching for: "MyString"
Columns i want to select: "ID, TargetColumn"
Thank you very much for the response, its correct.
But i still had a problem, with SP error. Chat GPT has helped me informing that using substringof() on Note Field (Multiline Text Field) is not supported, only Text field is working.