Free tech tip: https://cht.sh/ serves practical, usage-focused help on common command-line tasks. You can visit the website, or even better, curl for what you want.

$ curl cht.sh/touch

gets you this:

 cheat:touch 
# To change a file's modification time:
touch -d <time> <file>
touch -d 12am <file>
touch -d "yesterday 6am" <file>
touch -d "2 days ago 10:00" <file>
touch -d "tomorrow 04:00" <file>

# To put the timestamp of a file on another:
touch -r <refrence-file> <target-file>

Append with ~ and a word to show only help containing that word:

$ curl cht.sh/zstd~compress

Result:

 tldr:zstd 
# zstd
# Compress or decompress files with Zstandard compression.
# More information: <https://github.com/facebook/zstd>.

# Decompress a file:
zstd -d path/to/file.zst

# Decompress to `stdout`:
zstd -dc path/to/file.zst

# Compress a file specifying the compression level, where 1=fastest, 19=slowest and 3=default:
zstd -level path/to/file

# Unlock higher compression levels (up to 22) using more memory (both for compression and decompression):
zstd --ultra -level path/to/file

For more usage tips, curl cht.sh/:help.

I’ve gotten in the dumbfounding habit of searching man <program> on the web instead of in the terminal I’m already typing in.