If I filled the system hard drive, and I'll delete anything on it, it's off and on the external drive, or can I safely clean the system hard drive and all that was done in the Time Machine in the same place, on an external hard drive and will remain ?

Please help

Time Machine does delete "old" backups, eventually.  "Eventually" is controlled by whether or not you have used all of the space on the TM drive.  If you have "more free space" on the TM drive, then nothing should be deleted yet.
If youd elete files from a system drive, and continue on the same TM set, TM does NOT scour all old records to purge missing files ... else the "time" part of "Time Machine" makes no sense.

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