how to learn basics of creo

lot of tutorials available, through internet. you can learn from it or you can go and join any cad center to learn basics.

If you have access to it, PTC Learning Exchange. https://learningexchange.ptc.com/tutorials/by_product/ptc-creo/product_id:1

If not, youtube.

Please check the following discussion: https://community.ptc.com/t5/PTC-Academic-Program-Discussions/How-are-you-learning-Creo-Parametric-CAD/td-p/263049