To make latex look different you use a class. Templates aka class.

classes can be found on CTAN. search class.
CTAN is like CPAN. same idea, but latex instead of perl.

here's some notable classes, as I research for something to use for
data sheets for my company

https://ctan.org/pkg/erdc
this is a us army corps engineers formatted class. 

https://ctan.org/pkg/active-conf
(the example pdf is the class, i think) EDIT: this is boring. ignore.


https://ctan.org/pkg/jmlr
this one is very direct, and not bad. decent.


https://ctan.org/pkg/ieeetran
ieee format. Somewhat pedantic. two column


https://ctan.org/pkg/nostarch
no starch press. really a book format. i don't like it. but its book
looking.

https://ctan.org/pkg/computational-complexity
this one is good. readable. nice.


https://ctan.org/pkg/hitec
this one is good. simple data sheet format. add logos and you are good.
except the sample says win is good. dropped.

https://ctan.org/pkg/technics
this one is ok. not the best, but not bad.

https://ctan.org/pkg/ycbook
interesting book style. Has a very upbeat appearance. Consider this one.

https://ctan.org/pkg/nih
good for a resume. has example. not good for articles.


https://ctan.org/pkg/sae
decent, but needs a better font. basic simple.

https://ctan.org/pkg/unitn-bimrep
bimonthly report. notable. unique. not good for resume or data sheet, but perhaps for hours invoicing.

https://ctan.org/pkg/beilstein
good for data sheet, but needs sans serif not serif

https://ctan.org/pkg/gzt
good textbook format. 

https://ctan.org/pkg/novel
basic fiction book format. decent.

https://ctan.org/pkg/topletter
good letter format

https://ctan.org/pkg/skrapport
ery simple. good, but too simple for me. i want mine like electronic data sheets.


https://ctan.org/pkg/dccpaper
close to right. consider this one. 8/10

https://ctan.org/pkg/nwejm
decent, but not perfect. 7/10


https://ctan.org/pkg/langsci
Very good. perhaps, I will use this for my book (not for data sheet, unless you can horizontal line)

https://ctan.org/pkg/elsarticle
good. 8.5/10 but needs some customization (logos, etc)

https://ctan.org/pkg/prtec
decent. with default font, very commanding serif. ordering almost.

https://ctan.org/pkg/iodhbwm
very good. 9/10. Could possibly test. font is serif though.

https://ctan.org/pkg/elegantbook
notable for its relaxed tone, due to teh font, but perhaps too slow to read.

https://ctan.org/pkg/asmejour
decent but needs larger font.

https://ctan.org/pkg/dtk
7/10 data sheet class. needs horizontal line at top







MUST HAVES:
must have horizontal line at top of each page.

must have readable font.



Overall:

best are:
https://ctan.org/pkg/jmlr



https://ctan.org/pkg/erdc
army core one. v good.

I've decided to start with erdc one for now. Let's customize and reuse.



https://ctan.org/pkg/microtype
not a class, but a font package that allows adjusting letterspacing. Always required.