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 |
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FAQ
Q: Do I need to create an account to use Claude? Yes, a free account is required to use Claude. You can sign up at claude.ai using a Google account, Apple account, or email address. The free tier gives access to Claude's core capabilities without a payment method — no credit card is required to get started.
Q: What types of files can I upload to Claude? Claude accepts PDF documents, plain text files, images (PNG, JPG, GIF, WebP), spreadsheets (CSV, Excel), Word documents, and various code files. Individual file size limits apply, and very large files may be truncated. Claude can read and analyze uploaded files, extract key information, and answer questions about their contents.
Q: Can Claude remember previous conversations? By default, each Claude conversation starts fresh with no memory of previous sessions. Claude Pro users can use Projects, which maintain persistent instructions and uploaded files across all conversations within that project. Without Projects, you need to re-provide context at the start of each new session.
Q: Is Claude better for certain tasks than others? Claude excels at writing and editing, code generation and debugging, document analysis, structured reasoning, and tasks that benefit from long-form explanation. Claude performs best with clear, specific prompts. Tasks involving real-time data (stock prices, current events) or browsing the web are outside Claude's capabilities unless specific tools are enabled.
Q: Can I use Claude for work or commercial purposes on the free plan? Yes. Anthropic's terms of service allow commercial use on both free and Pro plans. The main difference is usage limits — free accounts hit limits much sooner than Pro. For high-volume commercial use, the Claude API at console.anthropic.com provides explicit rate limits and pay-as-you-go pricing.
Prevention Tips
- Write a reusable "context block" for recurring tasks — a 3–5 sentence summary of who you are and what you need — and paste it at the start of new conversations
- For long documents, ask Claude to summarize or extract key sections before asking detailed questions, to preserve context window space
- When getting started with a new task type, explicitly ask Claude to explain its approach before executing — this helps you calibrate expectations and catch misunderstandings early