What Claude Is
Claude is an AI assistant built by Anthropic. Like ChatGPT, you have a conversation with it — type a message and it responds. Unlike search engines, Claude generates answers directly rather than returning links.
Claude is particularly known for:
- Long-context handling — it can read and analyze very long documents (up to 200,000 tokens) in a single conversation
- Precise instruction-following — Claude tends to do exactly what you ask, in the format you ask
- Nuanced writing — Claude produces writing that reads as more considered and less formulaic than many AI tools
- Honesty about uncertainty — Claude will say when it does not know something rather than confidently guessing
Step 1: Create Your Account
- Go to claude.ai
- Click Sign up
- Choose: Continue with Google, Continue with Apple, or email
- If using email, verify with the code sent to your inbox
- Complete the short onboarding
Free account, no credit card required.
Step 2: Start a Conversation
The text box is at the bottom of the screen. Type a message and press Enter or click the arrow button. Claude responds in real time.
Try a few different types of tasks to get a feel for what it handles well:
- "Summarize the key arguments in this text: [paste an article]"
- "Write a professional LinkedIn post announcing that I got promoted to senior designer."
- "Explain the difference between TCP and UDP like I am not a developer."
- "Review this Python function and suggest improvements: [paste code]"
Step 3: Choose Your Model
At the bottom of the chat input, click the model selector:
- Claude Haiku — Fast, lightweight, free tier default. Best for quick questions and simple tasks.
- Claude Sonnet — Balanced capability and speed. Best for professional writing, analysis, coding (Pro plan).
- Claude Opus — Most capable, slower. Best for complex reasoning and high-stakes output (Pro plan).
For most tasks, Sonnet is the right choice. Switch to Opus only when Sonnet's output is not good enough and quality matters more than speed.
Step 4: Upload Files and Documents
Claude can read files you attach directly in the chat:
- PDFs — Contracts, research papers, reports — paste their content or upload the file
- Text and code files — Claude reviews, summarizes, or edits them
- Images — Claude describes, analyzes, or reads text from photos
- Spreadsheets — Paste as text or describe what you need analyzed
Drag files into the chat window or use the attachment icon. File context is available for the current conversation only.
Step 5: Use Projects for Ongoing Work
Projects (Claude Pro) let you create a persistent workspace where you can:
- Upload documents that Claude references in every conversation within the project
- Maintain context across multiple sessions without re-pasting background each time
- Organize different workstreams (one project per client, per research area, per codebase)
To create a project: click New Project in the left sidebar, give it a name, and upload any relevant documents. Claude in that project always has access to those files.
Step 6: Write Better Prompts for Claude
Claude follows detailed instructions well. The more specific you are, the better the output.
Basic prompt: "Write a bio."
Strong prompt: "Write a professional bio for my website. I am a UX designer with 7 years of experience, focused on fintech apps. My tone should be confident but approachable. Length: 3 sentences. Avoid buzzwords like 'passionate' or 'driven.' End with a mention of my podcast about design systems."
Tips that work specifically well with Claude:
- Give the full context upfront — Claude handles long prompts very well and uses all the context you provide
- Specify format explicitly — "respond in a table," "use numbered steps," "no bullet points"
- Tell it your audience — "for a non-technical reader," "for a senior engineer," "for a 10-year-old"
- Ask for multiple versions — "give me 3 versions with different tones" works reliably
Common Mistakes to Avoid
- Starting a new chat for follow-ups — Stay in the same conversation. Claude tracks the full context of the current session, so you can refer back to earlier points without re-explaining them.
- Vague prompts — "Help me with my presentation" produces generic output. "Create a 5-slide outline for a 10-minute pitch to seed investors, focusing on the problem and our unique solution" produces useful output.
- Pasting only part of a document — Claude's context window is very large. If you have a document to analyze, paste all of it. Partial context leads to incomplete or inaccurate analysis.
- Expecting Claude to access URLs — Claude cannot browse the internet unless you are using a browser-enabled version. Paste the text of articles or documents rather than sharing links.
- Not iterating — If Claude's first response is 80% of what you need, tell it exactly what to fix. Claude handles revision requests very well. One round of feedback usually gets you to the final version.
Quick Reference: Best Use Cases for Claude
| Task | Prompt structure | |------|-----------------| | Summarize a document | "Summarize the key points of this in 5 bullets: [text]" | | Edit writing | "Improve clarity and remove filler words: [text]" | | Analyze data | "I have a table of sales figures. Identify trends: [paste table]" | | Code review | "Review this function for bugs and suggest improvements: [code]" | | Draft from scratch | "Write a [type] for [audience] about [topic], tone: [tone]" | | Answer a question | Ask directly — Claude gives thorough, well-sourced answers |