How can I improve my spelling?
For trouble with spelling, it can be helpful to learn some general spelling rules that apply to English. Here's a link to a nice online resource for such rules: Spelling Rules.
And here's another that goes into more detail: Spelling
You could also try this website https://howtospell.co.uk/
Keep a vocabulary notebook and record the mistakes you make with spelling. Then, you will need to spend extra time practicing spelling words correctly. You can also turn off the spell checker on your computer, and then when you finish writing, turn it back on. This will give you a good selection of words that you need to work on spelling correctly.