Recommended standard practical tools to start exploring/applying semantic web technology

Hello everyone,

What are the recommended typical standard practical tools for Semantic Web
Technology that someone has to know if someone wants to start
exploring/applying Semantic Technology? What are the Semantic Web
technology/tools that typically being used in industry?

For example: in the area of database, one could start with something like
MySQL, PostGre, H2, etc. In the area of machine learning, one could start
with scikit-learn, tensor-flow, apache spark, keras, pytorch, etc. In the
area of front-end/UI development, one could look at react, vue js, etc.

Thanks!