I read up about Gas and Gwei but there are some things in practice that i don't understand / know what to do. I just started learning about Ethereum (received my first ETH coins today and started using Metamask and exchange markets( GDAX, Kucoin). Here are some questions i can't seem to figure out or be sure on my own...
When i transferred varying amounts of ETH from GDAX to Kucoin, the Gwei seems to be automatically set at 100+ (110 to 122). My understanding is that that is a pretty high Gwei and is not necessary. I can't seem to figure out how to adjust the Gwei value though. Is there a market exchange specific setting to adjust Gwei for xfering ETH?
Does the transfer fee vary at all depending on the amount of ETH transferred? I thought it would make sense for it to vary, but what i find is that i pay the same amount of fee even when i transfer a small amount of ETH.
The "Gas Used" amount also seems to remain constant for any amount of ETH xfer i tried (at 21,000). Is this a value that i can adjust? Or is it always set like this?
Well... maybe not just an ETH question but.. i'm missing a transfer i made to KuCoin. Since that particular xfer wasn't showing up on my Kucoin account, i went to Etherchain.org to check up using the transaction hash. It shows everything was ok: correct wallet address, 1819 confirmations in green text, confirmed in 58 seconds, etc... everything seems fine. But that xfer just hasn't been made into Kucoin. Is this a not-so-uncommon problem that has to do with Kucoin (like they somehow "lost" the incoming transfer or something)? How would you resolve such issues?
The whole Gas usage and Gwei thing seem a bit confusing... It seems though.. is Bitcoin more expensive when transferring? Also, the transfer fee doesn't depend on the amount you transfer, is that correct? This seems a bit.. unreasonable to me as a newbie, but i suppose there are reasons developers made it like that.. Is it always a better idea to transfer a large amount of ETH / BTC at once, instead of small amounts in multiple transactions?
Many noob questions.. hope you're not annoyed :) Thank you