i do not capitalize first letters unless it's an acronym or an important proper noun. this makes the writing look less official, more of a comment than an official announcement. "u" and "tho" and the like is a style. it's easy to spot this style, in case i change username but wish to preserve the signature of my internet voice.

as for other grammatical errors, it may be due to the late post, typing on a slow phone, lack of grammar review (maybe it's time...), or seed oils in the restaurant meal. i usually have someone proof-read thru my posts before i finalize but do not strive for perfection. 😁🤷