Transfer Coins to Ledger

Hi guys,

I am very new to crypto, maybe you can help me with some questions.

I have bought my coins on Binance and all my coins (approx. 8-10) are currently there. To safe my money I have already a ledger and I want to transfer everything to that cold wallet.

For some coins there is no problem, network fees are cheap and there is a coin network (example Solana).

But how can I transfer coins like GRT or LINK? If I use ETC20 the network fee would be around 15 bucks. Can I use instead Polygon for GRT? Ledger and Binance both support Polygon for GRT or are there any risks but not transferring via ETC20?

How safe is it to keep the coins on Binance?

Thanks for your help!