That's a pretty vague spec. If you are starting a ne job I'd ask the people who have hired you to supply info about what they think you need to know. Ask if there will be training and/or mentoring. C++ is a beast and if have no experience then it's a long way to the top.

Short of that Google "modern C++ tutorial" and go from there.

Also project Euler. Try to solve the problems in C++ and see how you go.