YES but NO, it's not staking, it's locking so be sure to understand the differences taking a look at this guide. Locking your RBN will also give you a percentage of protocol revenues, paid weekly in ETH. You can proceed to lock your RBN on the Governance portal: https://vote.ribbon.finance/
Here's a Dune dashboard made by our fellow Ribbonato Lewi: https://dune.com/lewi/VeRBN-Ribbon-Finance
Although you can claim whenever you like, please note that you'll accumulate at every block but rewards are restocked weekly. For more information, take a look here.
No, you just need to stake them once.
You receive both APY from the vaults and pool rewards.
In order to lock your RBN for various durations you'll have to split them between wallets. Be mindful of your vault position(s), as you will likely lose the boost. Please, check our guide.
Your voting weight decreases over time but your boost will take notice of your decreasing voting power at certain checkpoints like withdrawing or staking. For example if you start at 1000 veRBN and your voting power decreases to 800 veRBN, your boost will still use your original voting power of 1000 veRBN until a user checkpoint.
After creating or adding to your lock, you need to click the "Apply Boost" button on each gauge you're providing liquidity in to apply the boost. Your boost can also be updated by depositing and withdrawing from a gauge as well as claiming RBN.