Start building your toolbox and cookbook. Use the examples that are useful to you and customize them to suit your needs. Take some of the existing examples and expand upon them. Can you think of other ideas? How can you modify some of the programs to be more useful? Are any of the examples useful as-is in your own toolbox? Do they give you any ideas for other custom tools? Explore more of the Go standard library and write applications to fill your toolbox.
Start practicing and using some of the tools provided. You may need to find or build your own test network, or just a simple VM, or find a bug bounty program. If you decide to try out bug bounties, be sure to read the scope and rules with a microscope. To put your new tools and skills in to action, research application testing and network penetration methodologies. If you want to become a penetration tester...
