you should start with mangas probably. depends on if you're okay w smut or not. also depends on what gener u like in general. if you like scifi / action type "global examination" is a good one, it's very slow burn. "my love mix up!" is a great shoko/shonen ai peak, which i recommend as it also got a hetero second couple so the transition from straight romance to bl would be bit smoother. it's also funny as hell.
it's not on here in full, but "love for sale"
https://www.mangago.me/read-manga/shinyuu_tte_soko_made_shinakucha_ikenai_no/
https://www.mangago.me/read-manga/instructor_chiba_isn_t_flattered/
https://www.mangago.me/read-manga/my_bias_appeared/
https://www.mangago.me/read-manga/all_about_lust/
https://www.mangago.me/read-manga/sex_sales_driver/
https://www.mangago.me/read-manga/spinach_bouquet/
https://www.mangago.me/read-manga/one_room_ta/
If you aren't sure if you'll like BL you can try reading something with a strong plot like "King's Maker" (9.7). There is a mature and non-mature version so you don't have to fully commit to the smut if u aren't used to it.
"Green Apple Paradise" (9.5) is a classic and pretty much just romance and doesn't turn 18+ until the third season.
"Park Hanhoo's Manager" (9.6) is one of the first enemies to lovers I read when I got into BL, so I think its a good start if you want something completely 16+.
"Payback" (9.5) is one of the best enemies to lovers I've read, it's a bit angsty though so I'm not sure if that's your thing.
https://www.mangago.me/read-manga/sangen_tonari_no_tooi_hito/
https://www.mangago.me/read-manga/merry_checker/
https://www.mangago.me/read-manga/mr_100_perfect/
https://www.mangago.me/read-manga/perfect_buddy/
okay, now I'm done! it's pretty much just stuff I like ╮( ̄▽ ̄)╭
Alright.
https://www.mangago.me/read-manga/unromantic/ It’s been a while since I’ve read it, but this story is a pretty decent starting omegaverse. It does the dominant bottom trope very well, so I’m sure this’ll be enjoyable.
https://www.mangago.me/read-manga/romance_but_not_romantic/ A better starting omegaverse imo. This one explains a few other omegaverse qualities that the other one doesn’t. Plus this is just a good yaoi in general.
https://www.mangago.me/read-manga/don_t_mess_with_the_puppy/ I won’t say this is a good BEGINNER yaoi, just a good yaoi in general. The chemistry between the seme (top) and uke (bottom) is so good, it would get me an A in a chemistry class.
https://www.mangago.me/read-manga/i_m_not_your_guide_to_destiny/ I haven’t read many enemies to lovers yet, but THIS is what a good enemies to loves should be. They aren’t needlessly cruel to eachother and genuinely care for one another even though they fight.
I CLICKED POST ON ACCIDENT I WASNT DONEEEEE
I’m lowkey too lazy to describe the rest of these ☹
https://www.mangago.me/read-manga/accident_warning/
https://www.mangago.me/read-manga/my_guildmate_next_door_shortcut_scans/
https://www.mangago.me/read-manga/blood_poker/
https://www.mangago.me/read-manga/biscuit_1/
https://www.mangago.me/read-manga/mr_tiger_thank_you_for_the_meal/
https://www.mangago.me/read-manga/wild_beast_warning/
https://www.mangago.me/read-manga/see_you_my_king/
https://www.mangago.me/read-manga/family_liver_registry/
https://www.mangago.me/read-manga/guiding_hazard/
https://www.mangago.me/read-manga/unsleep/

Can someone give me some good advice about Yaoi to start wtih?