single end Trimmomatic

I’ve got a sra file in fastq format and I need to run single end Trimmomatic on the file. I’ve downloaded Trimmomatic in a new environment using conda command
conda create -n trimmomatic trimmomatic
the command I used for executing the function is :

trimmomatic SE -threads 4 SRR12304924_1.fastq/SRR12304924.trimmed.fastqHEADCROP:19

the output I get is

Usage: 
       PE [-version] [-threads <threads>] [-phred33|-phred64] [-trimlog <trimLogFile>] [-summary <statsSummaryFile>] [-quiet] [-validatePairs] [-basein <inputBase> | <inputFile1> <inputFile2>] [-baseout <outputBase> | <outputFile1P> <outputFile1U> <outputFile2P> <outputFile2U>] <trimmer1>...
   or: 
       SE [-version] [-threads <threads>] [-phred33|-phred64] [-trimlog <trimLogFile>] [-summary <statsSummaryFile>] [-quiet] <inputFile> <outputFile> <trimmer1>...
   or: 
       -version

what command should I use?