Rookie here, encryption software recommendations before uploading to the cloud?

Do any of you use encryption software? Free or otherwise? If so which ones do you use. I've got 1TB cloud storage I want to use it for some Iso's etc, but wanted to see if it would be best to encrypt them before uploading them to the cloud.

submitted by /u/Lifes_punchline
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from hacking: security in practice https://ift.tt/3FOBKJt