Should I keep 1 BTC or 10 BTC on my wallet until 2025?

No one can tell you how much Bitcoin to keep, nor should you listen to anyone. That’s something you got to figure out on your own. I can tell you: never invest more than you can afford to lose!

Whatever else, just make sure the wallet you choose is secure and non-custodial, meaning to say, it is accessible only by you via private keys, preferably on a device only you access and never connects to the internet (since you don’t want anyone trying to access it).

Try Bitamp to familiarize yourself with non-custodial wallets before you move on and find the perfect long-term storage!

Electrum is standard for Bitcoin wallets, and that is why most hardware wallets are supporting connection with Electrum wallet and I think that is better than using their native applications.

I don't like using Blockchain web wallet, but I would consider testing and using Bitamp web wallet if there was some way to connect it with hardware wallets like Trezor or ledger.
Few suggestions I would make is to make bech32 native segwit address a default format to reduce fees (I see that legacy format is currently default format).
Your Tor version bitamptortcbtgit.onion should be more advertised, and not only written with small letters on the bottom of the page.

Thanks for the feedback, we do agree bech32 should be default but newbie users might then not realize they need legacy for some services (shocking but true many old services still can't support bech32).

Maybe some of those services can't generate bech32 address for receiving Bitcoin, but every address can receive coins sent from bech32 addresses that are universal senders.
I can send coins from my bc1 address to legacy format starting with 1, to addresses starting with 3 and to other bc1 address, so there is no reason for Bitamp to keep legacy address format as default especially for newbies who are more likely to complain about higher fees.

The first and most obvious guideline is that you should never store large sums in a wallet that does not provide you with your private keys or a seed phrase. Bitamp is a non-custodial open source wallet, so it's an obvious pick. It offers traditional functionality with easy accessibility by any browser. This means it can be used by anyone who has no advanced technical knowledge of bitcoin softwares or blockchain architectures.

All Bitcoin wallets require users to ensure their private keys and seed phrases are safe. When we compare the impact of the two wallets, hardware wallets look more useful since they have all the benefits of software or web wallets but without the extra risk. However, as stated by bitampcom, online (hot) wallets are often used to store smaller amounts. And, prevent account hacking or illegal funds transfers, you should be aware of the various ways where you can protect yourself from online threats.
Given their cost, I don't see the point in buying a hardware wallet to store less than a few hundred dollars worth of crypto. However, that is merely my opinion, and I understand if someone disagrees.

I would agree, but sometimes people believe if they buy something and set their minds to it as a symbol of intent, it becomes easier to achieve the longer term goal. I know many people who bought a hardware wallet first before even buying their first crypto:)

How do you run a Bitcoin node and what does it mean?

Just means they're running one of the computers helping to secure the network by verifying transactions. Even you can do it easily with only about $100 cost by buying a Raspberry Pi (it can even come preloaded). This is one simple guide that should get you up and running in no time!

I use Metamask but I don't like it much and any wallet like that. As use extension in browsers in not my preference if I have options to choose.

I have weird idea, swap. Can Bitamp team consider to build up a swap feature (or sweep wallet) for bitcoin stores in a Legacy address to another address type, please. I know Bitamp gives three options with three types for bitcoin wallets.

What I suggested is for people who store bitcoin in a Legacy address but later want to move their bitcoin to a Bech32 address. They also don't want to manually move their bitcoin, just want convenience and being lazy. Click on swap or sweep wallet and finish. 

I agree that Paypal is probably the worst place for holding your bitcoin even worse than using exchanges, but people still use it a lot.
Maybe they are just lazy or they don't want to take any responsibility for holding their own wealth, and maybe most people are not yet ready for Bitcoin.
Sad, but it's probably true.