When I was young it was explained to me as "going out of your home" so you could "go about town". To be out and about is to be out of your home and going about your daily activities. People frequently use it when they are going to work, running errands, and doing things like that. Hope this helps!

For 25 it is understandable, but future is much better. Either "I will call you later" or "I'll call you later" are correct. 26: "I miss her so" is fine, but it wouldn't be understood as "I miss her also", it would mean "I miss her so much" or "I miss her a lot." 27. "Hold it like so" is usually used when the speaker is demonstrating how to hold it. You might say "Hold it like so" as you are holding something and want the other person to copy you. 28. "I am through with this relationship" means "I am done with this relationship" or "This relationship is over". It's usually used when breaking up (ending a relationship), often if the speaker is upset. To be "through with" usually means to be finished with or to be done with. It can be used for relationships, meals ("Call me when you are through with dinner"), or many other things 29. Same as above, "through" means to be finished or done. "Did you read the whole article?" is another way to say it. 30. "He had a hard time building the deck completely even." This is a little confusing without reading it in context. It probably means it was difficult to build the deck well or to build it straight. "Even" here means straight, lined up, or flat. I hope that helps!

Good question! Bay and gulf are very similar. A bay is part of the coast where the water comes inland. So it is a body of water almost surrounded by land on 3 sides and is usually connected to the ocean. It is usually shaped like a U or or a C. A gulf is a very, very large bay like the Gulf of Mexico or the Gulf of Thailand. Loch is the Gaelic word for lake. It is mostly used in Ireland and Scotland. Loch can also mean inlet, which is where the ocean comes into the land as a long, narrow body of water. It resembles a thin lake or river of ocean water, rather than the open U or C shape of a bay. Port and harbor can be similar. A port is bigger and has more equipment because it is where large ships can dock and load or unload people and cargo. A harbor is where ships can seek shelter from bad weather. Some harbors are built almost like a port, but others are not built. They can just be naturally safer places for ships to go, like a bay or inlet.

Los Angeles?

Hey, what do you know about LA? I wanna live in this city so much because weather in LA is better than weather in some Belarusian cities (in my opinion). I also like this city because it is in California state and because of its beauty!
I'm sick and I didn't go to school today. I'm just sitting on the bed and writing this. It's my first post in Notebook and I hope you will correct this and maybe commented:)

(You can write "It's my first post in Notebook" because it refers to italki's "Notebook" or you can write "It's my first post in my notebook". Either is good!)

It is understandable, but I would suggest changing it to: You didn't only underestimate yourself, but you also overestimated yourself. You could also shorten it to: You not only underestimated yourself, you overestimated yourself.