Cross Bridge

Binance Smart Chain to Polygon:

First, convert your funds or other tokes to USDT or USDC.

Xpollinate Bridge: You can use the Xpollinate bridge here.

EVOdefi: https://bridge.evodefi.com/?token=USDC offers a bridge to send tokens from the BSC chain to the Polygon chain, there is a 0.5% fee but the process is very easy and fast.

Ethereum Main Network to Polygon:

If your funds are on the Ethereum Main Network you can use the Matic bridge here.

Polygon Bridge: https://wallet.matic.network/bridge/