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Training Resources
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Free Resources
Specterops Blog - The Renaissance of NTLM Relay Attacks - This is a deeep dive into NTLM relays, which are at the heart of almost everything we do with Responder, Impacket, etc. Its very technical and will take a long time to get through. Put in the effort and your knowledge will increase significantly.
OSCP Blog from Kieran Croucher at Specterops - Some good tips for those tackling this certification
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Paid Resources
Ask your manager about training budget if you are interested in paid courses.
Introduction to Pentesting with John Strand - Not a technical course. Tons of useful info about the business side of pentesting.
PEN-200 Course - This is the official prep course for OSCP. Not the best training out there, but you'll need it if you want to tackle this certification. OSCP prep represents a substantial investment of time and money.