You can start by using farmables and breaking them so that you can collect gems and seeds. After you plants the seeds, you wait for it to grow and break the tree. After breaking it, you can continue the steps which is by breaking them. I will be listing all the farmables that are well known.
Sugar Cane - 200/1 World Lock
Blackrock Wall - 100/1 World Lock
Venus Guytraps - 100/1 World Lock
Sharp Bass - 200/1 World Lock
Chandeliers - 5/1 World Lock
High Tech Blocks - 4-5/1 World Lock
Pinball Bumper - 50/1 World Lock
Ice - 20/1 World Lock
Space Connectors - 20/1 World Lock
And many more farmables.
If you just started playing Growtopia, welcome to Growtopia! This may be confusing if you are a newbie to Growtopia but, you will get the hang of it. :) I will be talking about other things on the next page! :)