The VASP manual contains information on all INCAR tags and tutorials and guides to several types of calculations ([https://www.vasp.at/wiki/ www.vasp.at/wiki/]).
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The VASP Support Forum ([https://www.vasp.at/forum/ www.vasp.at/forum/]) allows users to troubleshoot and discuss technical and scientific topics. The VASP developers are also active in answering questions.