What's the best free software for editing files?

Need to sync an srt to a video.

The SRT includes an introduction that is 47 seconds long that is not included in my video.

I need to remove 47 seconds from the beginning of the srt and shift everything back that far.

I've never worked with files before, and a quick ducking returns lots of freemium garbage.

Anyone with experience doing work have ant suggestions for me?

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