There are hardly any Bitcoin forks that are worth anything. If you bought Bitcoin before 1st August then you should have some Bitcoin Cash and Bitcoin SV (a fork of BCH). Before accessing and moving any of the forked coins, you should send all of your BTC to a new wallet. As far as I remember, Bitcoin Cash has implemented replay protection, but that's not necessarily the case for all of the other forks. You can use this guide to claim Bitcoin Cash and this one for Bitcoin SV. In my opinion, the other forks are not worth the hassle due to their low price.
Note: You should be able to use your Electrum seed in Electron Cash, so there is no need to export and import private keys for individual addresses.