Be careful
I must warn you, DO NOT ATTEMPT TO CROSS LAYERS IF YOU DON'T KNOW WHAT YOU'RE DOING!!!!
People have disappeared forever between the infinite amount of dimensions like a crumb between the sheets of a thick book. Others have gone mad. The accounts of such as H.P. Lovecraft are no stories! They are what happens when you're not prepared for what you will see. Because some of those you will encounter might melt your brain. Some rips are one-way streets. The child with the snow globe never came back, and likely never will.
Traveling has also been noted to promote insomnia. Which in turn makes you more vulnerable to psychic attacks. If you already struggle with sleeping, think twice whether you want to take the burden of knowledge onto your shoulders.
Another thing.
DON'T LET ANYONE KNOW YOU KNOW!!! Ideally, don't talk about it at all. If you have to, stay anonymous. If you learn to travel, don't tell anyone. I can't say more without putting you in more danger, so you have to trust me. All I can say is there are some that will try to use you if you know you can travel. I wish I had known this sooner.