If you want to use copyright to give permissions to others to re-use or build upon your work without permission and/or financial compensation, consider licensing your work under Creative Commons.
Under Creative Commons creators retain their copyright but give permission to share and use their creative works. Users of your material will still need to comply with whatever terms you have stipulated.
This chart will help you understand what license best suits you.
Adapted from Creative Commons Permissions Infographic by Aaron McCollough (adapted from a table by Anita Walz), licensed under a CC BY 4.0 licence.