Please tell me, I just created a wallet in Electrum. Is there a restriction on how much I can bring bitcoins there or not?
There are no restrictions. You can put all bitcoins you want in the same address/wallet.
However, as mentioned above, the biggest limitation is the security.
Unless you are a very experienced user who understands about cyber security, you should really consider buying a hardware wallet (specially Ledger or Trezor).
Hardware walelts are cheap, less than 100 bucks, and your coins will be 99.9% safe.
Electrum is a very good desktop wallet, however, we are human beings and we make mistakes. You may click in a phising website, a suspcious link, someone may infect your computer with a pendrive with viruses and so on... All those situations may expose your funds to hackers.