Where can I swap glmr?

I'm curious, could you please enlighten me on the various platforms or exchanges where I can conveniently swap or trade GLMR tokens? Are there any particular marketplaces or decentralized finance (DeFi) protocols that specialize in facilitating such transactions? Furthermore, what factors should I consider when selecting a platform, such as fees, security, and the availability of other cryptocurrencies to trade with? Your insights would be greatly appreciated.