Hey there and congrats on a good first question!
I second what Hipkiss says. Hashnode is a great place for people like you - and me. I am in the same situation, even though I work for a big company, I don't have anyone able to mentor me - however I have to mentor others and bring them up2date with patterns, algorithms, practices and additional knowledge.
Most of my skills are self-taught and confirmed via my B.Eng., however I also had imposter syndrome (and still sometimes have it), so Hashnode helped me a great deal to always verify my knowledge. I write answers and articles and read what others have to say. Seeing everyone agree with me on many topics really reassures me a lot - and whenever there is a problem with my knowledge, people chip in and correct me or add fresh ideas, which helps me grow.
I love the Hashnode community for being friendly, open and helping me gain something I would not get anywhere else! So I hope that you will be able to make the same experience; just go ahead and write questions and answers, we don't bite!